Static Server based on Sinatra

Using Sinatra provides better handling of mime types and supports
304's/etc.

Also updated the Gemfile to exclude most gem outside of developemnt
(default).
Added post_filters plugin

Plugins that extend PostFilter will get three
additional methods: pre_render, post_render and
post_write. These will be called when every page
or post is processed and allows for the plugin to
modify the post/page object directly to modify
the output beyond what can be done with just
markup.
Merge branch 'post_filters_plugin' of https://github.com/tedkulp/octopress into post_filters
fixed missing date in page headers
Added {% raw %} liquid block, allowing for blocks of code which are not parsed by Liquid
Merge branch 'post_filters'
1. Vastly improved backtick code blocks and added support for Textile
2. Refactored Octopress filters into Liquid filters and pre/post render filters (using post_filters plugin)
3. Added methods to raw plugin to prevent Markdown and Textile from parsing blocks
4. Updated render partial to invoke the pre_render method of post_filters
5. Moved Rubypants filter out of default.html into Octopress post_render filters
6. Added raw's safe_wrapper method to codeblock and include_code filters
improved backtick codeblock's handling of the raw option
Merge branch 'sinatra_static_server' of https://github.com/scottwater/octopress into scottwater-sinatra_static_server

Conflicts:
	Gemfile
	Gemfile.lock
updated Gemfile.lock
moved from Posix::Span to Process.span, fixing #46
Copy dotfiles also for subdirectories
Generate site before deploying, execute tasks in sequence
Move generate + deploy to separate task
Fix an issue in 'watch' and 'preview' where main process is terminated with child processes still running
added itegration to gen_deploy
removes index.html from canonical urls. closes #153
Fixes #150. Strip leading path before checking for excluded file.
Merge pull request #154 from jcsims/rake_dotcopy_fix

Fixes #150. Strip leading path before checking for excluded file.
Aligns naming of .pygments-cache, .gist-cache and .sass-cache