Bump Rack version to leverage security fixes.
Remove redundant require statement from Rakefile.
Ignore all generated JS bundles, preview-mode flag, generated _config.yml, and most editor temp files.
Remove cruft from Gemfile.lock since rspec is no longer specified in the Gemfile.
Fix static reference to instance method in Compass' config.
Bring over a couple little things from master...
Merge pull request #1051 from MrJoy/patches_from_master

Bring over a couple little things from master...
Merge pull request #1047 from MrJoy/remove_redundant_require

Remove redundant require statement from Rakefile.
Merge pull request #1043 from MrJoy/gitignore_cleanup

Ignore all generated JS bundles, preview-mode flag, generated _config.yml, and most editor temp files.
Merge pull request #1042 from MrJoy/fix_compass_integration

Fix static reference to instance method in Compass' config.
Allow .md for markdown files.
Some Jekyll plugins confuse Compass by mucking around with the CWD.

This keeps things behaving sanely in such cases.
Grand whitespace cleanup.
Removal of apparently unreferenced, dangling method.

(A search of the code reveals no reference to 'parse_category'...)
An update of rretsiem's pull request, for 2.1.
Merge pull request #1055 from MrJoy/allow_short_markdown_extension_redux

Allow .md for markdown files.
Merge pull request #1059 from MrJoy/compass_rigor

Compass rigor.
Merge pull request #1058 from MrJoy/grand_whitespace_cleanup

Grand whitespace cleanup.
Merge pull request #1056 from MrJoy/dead_code_removal

Removal of apparently unreferenced, dangling method.
Merge pull request #1064 from MrJoy/fb_async_21

Make FB JS load synchronously so it doesn't block page rendering.