Uprade minor apps dependencies.

- Django 1.6.1 --> 1.6.3
- paramiko --> maintenace
- markdown --> issues
- simplejson --> pings
- requests --> state.tasks, communitynetworks.models
- django-filter [REMOVED]
- django-google-maps --> gis
- django-fluent-dashboard
- django-celery-email
- django-extensions (show_urls, graph_models)
Updated version number 0.10.5beta
Cosmetics: api clean up old code.
Fix Decimal json encoding (simplejson to json migration)
[test] Postgresql auto-pk differs from sqlite3. Get it dinamically.
Include (again) django-filter to dependencies (used by API)
Define gis permissions (thanks Bart).
Upgrade gevent to satisfy dependencies.
Make timezone aware on existing migrations.
Define maintenance permissions, delete node related instance (#432)
Cosmetics.
Froze major changes and update version to 0.10.5rc
Released version 0.10.5
Raise 404 on help view for a not existing host.
Remove firmware config from API (#239)
Group into a new fieldset firmware configuration elements (#239)
Add 'sliver_mac_prefix' to excluded fields (#239)
Include UCI configuration to node UI (#383)
Include node UCI options on firmware generation (#383)
Node UCI options: improve interface titles (#383)