Merge pull request #94 from dodobas/develop

Fix missing changeset when working with admin
Create symbolic link to the REQUIREMENTS.txt
Add missing specification model tests
Be extra meticulous about model fields
Add django-pg-fts and LocalityIndex model
Add fts_rank to the specification and tests
Reverted botched up LocalityArchive test
Add SIG_locality_values_updated signal and handlers
Add initial map_clustering and tests
Add custom map clusterLayer implementation
Add custom cluster layer to the map
Handle bad/missing req. params for localites.json
Update README.md
Update REQUIREMENTS.txt
Update .travis.yml
Sort out Timified icons
Add iconsize parameter to localities.json
Remove PruneCluster support
Merge remote-tracking branch 'upstream/develop' into context_aware_map
Add psycopg2 back to the REQUIREMENTS.txt

psycopg2 is important to this project, any specific situations needs to be
handeled manually