Staging

1. fixed bug, fix the api view description shown improperly code link
2. change modified_date, created_date for serializers ManufacturerSerializer, InstitutionSerializer, InstrumentSerializer, ProjectSerializer, InstrumentCommentSerializer, InstrumentOnPlatformSerializer, SensorSerializer, PlatformCommentSerializer, SensorOnInstrumentSerializer, PlatformTypeSerializer, PlatformSerializer, PlatformPowerTypeSerializer, PlatformDeploymentSerializer, PlatformDeploymentCommentSerializer code link
3. refactor code and created CommentBoxAdminBase, BaseCommentBoxInline for all comment box feature code link
4. create model base ModelBase so the model have default field created_date, modified_date 5.institution have optional info except the name ST-29 - code link - view link
5. sensor tracker mocking database creation code link 7.remove django-suit dependency code link
6. fixed bug for cant delete instrument code link 9.added serial for sensor ST-28 - code link view link
7. fixed cant delete problem for sensor on instrument [code link](!74 (diffs)_ 11.from sensor view, show what instruments it has been on ST-31 - code link view link
8. list instruments that were on platform in platform view ST-30 - code link view link
9. include optional date/time field to indicate when an event happened as an alternative to writing it in the comment ST-32 - code link - code link- view link