Fix: compressor.filter.base Nullify self.type for Specializations to filter_type
Updated badges to be SVG and added Python3 port badge.
Fixed one badge that doesn't provide SVG.
Merge pull request #479 from iknite/fix_filter_base

Fix FilterBase clears self.type for subclasses
Use get_template() when dealing with django templates
Merge pull request #524 from diox/use-get-template

Use get_template() when dealing with django templates.
Fix cache backend for 1.7 compatibility (locmem:// has been deprecated for a while)