Link Feature to Project. Updated tests.
Model update
Implemented feature type + tests
Features + Tests
Update to Django 1.6
Validation methods for Fields input values
Adding and Removing Observations from features
Read/Write LookupValues using Ids

Fixes #3
Update and validation of Observations

Fixes #4
Minor refractoring
Refractoring
Implemented comments
Implemted responds to comments
Fixes #5
Implemented DateTimeField

Fixes #2
Improved getting, setting and deleting Observation field value
Implemented project update functionality
Feature and Observation update functionality + Tests
Merge branch 'View'