Merge branch 'fix/_/python_3.5_3.6'

.travis.yml

 
 install:
   - cd tracim && python setup.py develop; cd -
+  - echo coveralls >> install/requirements.txt; echo
   - pip install -r install/requirements.txt; echo
   - pip install coveralls
 

install/requirements.txt

 beautifulsoup4==4.3.2
 caldav==0.4.0
 cliff==1.8.0
-cmd2==0.6.7
-coverage==4.0b1
+cmd2==0.6.9
+coverage==4.4.1
 crank==0.7.3
 decorator==3.4.0
 gearbox==0.0.7