added xml to ignored extensions
added ability to pass prerender token header
make sure only GET requests are prerendered
added passing the headers through with the request
added ability to use PRERENDER_TOKEN env variable
Added before and after callback support to the middleware. Filter out bad headers from prerender service request that will leave requests hanging.
Better naming for phantomjs filtered headers constant.
remove debug logging
CloudFlare flexible SSL support and version bump
made extensions_to_ignore and crawler_user_agents more easily configurable
made build_rack_response_from_prerender configurable so that DISALLOWED_PHANTOMJS_HEADERS can go there
added a test and incremented version
added documentation for build_rack_response_from_prerender
Merge pull request #5 from collectiveip/callback-support

Caching callback support
added before_render support for returning entire response instead of just string
readme change
removed user agents of bots that support escaped fragment to prevent any cloaking issues
added .ico and .rss to extensions to ignore
added ability to pass prerender_token in initialize instead of ENV
incremented version