minor fixes

README.md

 Get the sources from Bitbucket:
 
     git clone https://bitbucket.org/lebouquetin/tracim.git
+    cd tracim/
 
 *Note: Now everything is documented to be executed from the tracim directory newly created.*
 
+
 ### Setting-up python virtualenv ###
 
 _Reminder : Tracim is developped and tested using python3._
 
     ./bin/pgtool create_user tracimuser tracimpassword
     ./bin/pgtool create_database tracimdb
-    ./bin/pgtool grant_all_priviles tracimdb tracimuser
+    ./bin/pgtool grant_all_privileges tracimdb tracimuser
 
 Notes :