Closes #76: Tracim working with sqlite

.travis.yml

 env:
   - DB=postgres
   - DB=mysql
+  - DB=sqlite
 
 addons:
   postgresql: "9.3"
   - sh -c "if [ '$DB' = 'mysql' ]; then cd ${TRAVIS_BUILD_DIR}/tracim && sed -i \"s/<replace_database_uri_here>/mysql+oursql:\/\/root@localhost\/tracim_test/\" development.ini; fi"
   - sh -c "if [ '$DB' = 'mysql' ]; then pip install https://launchpad.net/oursql/py3k/py3k-0.9.4/+download/oursql-0.9.4.zip; fi"
 
+  - sh -c "if [ '$DB' = 'sqlite' ]; then cd ${TRAVIS_BUILD_DIR}/tracim && sed -i \"s/\(sqlalchemy.url *= *\).*/\sqlite:\/\/\/tracim_test.sqlite/\" test.ini; fi"
+  - sh -c "if [ '$DB' = 'sqlite' ]; then cd ${TRAVIS_BUILD_DIR}/tracim && sed -i \"s/<replace_database_uri_here>/sqlite:\/\/\/tracim.sqlite/\" development.ini; fi"
+
   - cd ${TRAVIS_BUILD_DIR}/tracim && gearbox setup-app --debug
 
 # command to run tests

README.md

 
 * developed with python >=3.4.
 * based on the [TurboGears](http://www.turbogears.org/) web framework.
-* relying on [PostgreSQL](http://www.postgresql.org/) or [MySQL](https://www.mysql.fr/) as the storage engine.
+* relying on [PostgreSQL](http://www.postgresql.org/) or [MySQL](https://www.mysql.fr/) or [sqlite](https://www.sqlite.org/) as the storage engine.
 
 The user interface is based on the following resources and technologies:
 
 
     apt-get install mysql-server mysql-client libmysqlclient-dev
 
+Or if you want to use SQLite as database engine
+
+    apt-get install sqlite3
+
 ## Installation ##
 
 ### Get the source ###
 At this point, you have :
 
 * an installation of Tracim with its dedicated python3-ready virtualenv
-* a PostgreSQL/MySQL server and dedicated database
+* a PostgreSQL/MySQL server and dedicated database (if you don't use sqlite)
 
 What you have to do now is to configure the application and to initialize the database content.
 
 
     sqlalchemy.url = mysql+oursql://tracimuser:tracimpassword@127.0.0.1/tracimdb
 
+There is an example value for SQLite below :
+
+    sqlalchemy.url = sqlite:///tracimdb.sqlite
+
 #### Listening port
 
 Default configuration is to listen on port 8080. If you want to adapt this to your environment, edit the .ini file and setup the port you want:

tracim/test.ini

 port = 8080
 
 [app:main]
-sqlalchemy.url = postgresql://postgres:dummy@127.0.0.1:5432/tracim_test?client_encoding=utf8
+sqlalchemy.url = sqlite:///tracim_test.sqlite
 use = config:development.ini
 
 [app:main_without_authn]
 skip_authentication = True
 
 [app:ldap]
-sqlalchemy.url = postgresql://postgres:dummy@127.0.0.1:5432/tracim_test?client_encoding=utf8
+sqlalchemy.url = sqlite:///tracim_test.sqlite
 auth_type = ldap
 ldap_url = ldap://localhost:3333
 ldap_base_dn = dc=directory,dc=fsf,dc=org
 use = config:development.ini
 
 [app:radicale]
-sqlalchemy.url = postgresql://postgres:dummy@127.0.0.1:5432/tracim_test?client_encoding=utf8
+sqlalchemy.url = sqlite:///tracim_test.sqlite
 
 use = config:development.ini
 

tracim/tracim/controllers/admin/workspace.py

 
 from tracim.lib import CST
 from tracim.lib.base import BaseController
+from tracim.lib.helpers import on_off_to_boolean
 from tracim.lib.user import UserApi
 from tracim.lib.userworkspace import RoleApi
 from tracim.lib.content import ContentApi
         return dict(result = dictified_workspace, fake_api = fake_api)
 
     @tg.expose()
-    def post(self, name, description, calendar_enabled=False):
+    def post(self, name, description, calendar_enabled: str='off'):
         # FIXME - Check user profile
         user = tmpl_context.current_user
         workspace_api_controller = WorkspaceApi(user)
+        calendar_enabled = on_off_to_boolean(calendar_enabled)
 
         workspace = workspace_api_controller.create_workspace(name, description)
         workspace.calendar_enabled = calendar_enabled
         return DictLikeClass(result = dictified_workspace)
 
     @tg.expose('tracim.templates.workspace.edit')
-    def put(self, id, name, description, calendar_enabled=False):
+    def put(self, id, name, description, calendar_enabled: str='off'):
         user = tmpl_context.current_user
         workspace_api_controller = WorkspaceApi(user)
+        calendar_enabled = on_off_to_boolean(calendar_enabled)
 
         workspace = workspace_api_controller.get_one(id)
         workspace.label = name

tracim/tracim/lib/userworkspace.py

         role.workspace = workspace
         role.role = role_level
         if with_notif is not None:
-            role.do_notify = with_notif
+            from tracim.lib.helpers import on_off_to_boolean
+            role.do_notify = on_off_to_boolean(with_notif)
         if flush:
             DBSession.flush()
         return role

tracim/tracim/tests/__init__.py

         tbs.append(t)
         all_fks.extend(fks)
 
-    for fkc in all_fks:
-        connection.execute(DropConstraint(fkc))
+    if not config['sqlalchemy.url'].startswith('sqlite'):
+        for fkc in all_fks:
+            connection.execute(DropConstraint(fkc))
 
     for view in views:
         drop_statement = 'DROP VIEW {}'.format(view.name)