Added five new observation parameters
Explicitly set numZoomLevels for the map and each layer.
Notify user via popup when an observation has been saved.
Created Django views that return unique river, site and usernames
Added combo boxes of unique river, site and user names to filter form
Merge branch 'feature/filterform_autocomplete' into develop
Made site indicator circle easier to select and adjusted selection instructions
Enhanced visibility of 'Add observation' button in info window
Created icons for Site Data Display & Graphing component
Created a view that returns all observations for a site.
Created Site Details and Observations tabs
Added graph tab.
Completed site observation graphing function
Merge branch 'feature/data_explorer' into develop
Added csv data download view and js function
Merge pull request #3 from ismailsunni/ismail_fixes

Ismail fixes
changed score trigger to allow zero scores
added django-dirtyfields
Fixed models.py conflict.
Merge branch 'kartoza-master' into develop