WIP: Generate email templates wth inlined styles
WIP: Generate email templates wth inlined styles

The plan:

1. Parse the Django template into nodes
2. Interpret ExtendsNodes and IncludeNodes
3. Return a new Django template as a string
4. Generate an lxml tree from the resulting template
5. Replace <link rel="stylesheet"> nodes with <style> tags
6. Run toronado's CSS inliner on the resulting tree
7. Output the final Django template

Parts 1 and 4-7 work

codeforboston/cornerwise,cityofsomerville/cornerwise,codeforboston/cornerwise,cityofsomerville/citydash,cityofsomerville/cornerwise,cityofsomerville/citydash,cityofsomerville/citydash,codeforboston/cornerwise,cityofsomerville/cornerwise,cityofsomerville/citydash,codeforboston/cornerwise,cityofsomerville/cornerwise