Convert Our Simplates To Jinja2

Hey there, this pull request converts our existing Tornado simplates to Jinja2 simplates.

The changes in the actual simplates are the following:

- Quote all file include names
- Convert all end tags to endif, endfor, endblock, etc
- Convert u to unicode() (this was done because unicoded strings are available inside Jinja
- Convert 'is' and 'is not' to == and != 
- Convert escape() to string|e 

Before this is pulled in we need to fix the following things:

- [x] Look for any nonescaped, user supplied strings
- [x] Fix negotiated simplates
- [x] Push an update to aspen-jinja2-renderer
- [x] Include the required libraries in vendor so we don't have to download them.
- [x] Go over python code additions with an expert (@whit537 or @zwn maybe?) 


Thanks!



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