Fsmkeyfield

Update .gitignore to remove PyDev/eclipse stuff
Update django_fsm :
* Update db/fields/fsmfields.py
** Add FSMKeyFieldDescriptor class
** Update FSMKeyField class
* Update db/tests.py
** Update BlogPost test to avoid deprecation warnings on transition() field parameter
** Add DBState model
** Add FKBlogPost model based on BlogPost model
** Add FSMKeyFieldTest based on FSMFieldTest
WARNING: tests are not currently OK !
Update tests/testapp
* Update manage.py
** Add python shebang
* Update settings.py
** Add db creation path
* Update models.py
** Add a DbState model
** Add a FKApplication model, with a state FSMKeyField
* Add fixtures/initial_data.json for DbState populating