Ignore .cache by default in .gitignore
Improvements to the /__middleman/ metadata pages.

Includes formatting/styling changes to clarify the data being presented as well as align styling with middlemanapp.com. Also adds features and fixes to the sitemap view to show ignored files differently, hide redundant information, print data/options as a hash instead of as array pairs, and to list out available locals defined on a page.
Merge pull request #1229 from bhollis/metadata

Improvements to the /__middleman/ metadata pages
Webrick should not do reverse DNS lookups

This prevents Middleman server from being terribly slow over network. Closes #1118.
Merge pull request #1232 from lolmaus/patch-1

Webrick should not do reverse DNS lookups
Include the destination_path in the instrumentation payload.
Merge pull request #1234 from kaleworsley/more_details_in_the_instrumentation_payload

Include the destination_path in the instrumentation payload.
Clean up extensions a bit. Removes newest form of registering extensions, more consistently sets and uses an extension's ext_name, and makes a lot of things errors instead of just log messages in hopes that people can't get too far with a messed-up config.
Remove yet another way to register extensions and register/activate FrontMatter like a normal extension.
Fix some references to extensions[:frontmatter]
Remove Asciidoc support in favor of a middleman-asciidoc extension.
Merge pull request #1237 from bhollis/ext

Clean up extensions a bit
Merge pull request #1238 from bhollis/asciidoc

Remove Asciidoc support in favor of a middleman-asciidoc extension
Add options hash to asset methods to allow special options to be passed through from extensions
Update haml and sass deps
Update haml and sass deps

Conflicts:
	Gemfile
	middleman/middleman.gemspec
Notify slack
Unvendor padrino
bump uglifier dep
revert back to sass 3.2 and stable compass