Add django and python projects.
Merge pull request #169 from proofit404/python-support

Add django and python projects.
Fix Ag support
Merge pull request #170 from lunaryorn/fix-ag-support

Fix Ag support
[Fix #171] Don't cache ignored files
[Fix #173] Ignore some buffers depending on the major mode used

Add a custom variable to ignore some buffers when they are a major
mode. A list of regular expressions is used to identify the major
modes to be ignored. The current list is quite arbitrary.
Merge pull request #174 from vincentbernat/feature/ignored-modes

[Fix #173] Ignore some buffers depending on the major mode used
[Fix #172] Add an option to purge files/subtrees from cache
Fix a typo in `projectile-cache-current-file'
Fix integration build