Merge pull request #29 from rosskarchner/master

some minor README tweaks
Now checks to see if a custom template file exists
Removed a call to 'reverse', and fixed some other errors that the fix
exposed
Merge pull request #30 from dpford/allow_custom_templates_for_individual_posts

Now checks to see if a custom template file exists
exposes current date in templates
Merge pull request #32 from rosskarchner/get_document_for_indexers

Removed a call to 'reverse', and fixed some other errors that the fix exposed
Merge pull request #33 from dpford/expose_current_date_in_template

Expose current date in templates
Valdiation for date range filter
Fixed some formatting
Removed the specfic version of itsdangerous because there was an issue on RHEL systems (not sure if also for debian-based systems) where it would not download from pypi.  It seems that removing the version here fixes the problem.
Merge pull request #35 from Ooblioob/master

Removed the specific version of itsdangerous in requirements.txt
Merge pull request #34 from dpford/date_range_validation

Date range validation