Fixes issue found in Ubuntu 14.04 with request.body

Debugging information can be found at:
https://gist.github.com/ingenieroariel/74c5d4b3875799d50b3d

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Add a text filter to search/explore pages - indicate what text was searched for if any, and allow user to modify this filter.  Based on main search input form.
Merge pull request #1574 from mbertrand/haystack5

Add a text filter UI to explore/search result pages
Add a GeoGit contrib package.
Merge pull request #1575 from garnertb/geogit-contrib

Add a GeoGit contrib package.
Add a flake8 configuration to setup.cfg.
PEP8 fixes in the api app.
PEP8 fixes in the base app.  Fixes #1577.
PEP8 fixes for the catalogue app.  Fixes #1578.
Bump geonode-user-accounts 1.0.2
Fix unresolved description variable in the base models.
Fixed PEP8 violations
fix pep8 violations in api