Fix jQuery version parsing for custom jQuery builds; fixes #146

Closes #148
Merge branch 'iamphill/jquery-version-fix'
organize test fixtures more
Merge pull request #154 from twbs/organize-fixtures

organize test fixtures more
grunt dist
Warns about deprecated .pull-* classes in .media

Closes #153
Merge branch 'iamphill/media-pulls'
grunt dist
Fix #92
Merge pull request #155 from twbs/fix-92

Fix #92
prep for v0.6.0
Add check for empty spacer grid columns used instead of grid column offsets

@cvrebert's overhaul of #143
Fixes #123
Closes #143
grunt dist
Merge pull request #158 from twbs/spacer-columns

Add check for empty spacer grid columns used instead of grid column offsets
Add backticks around HTML tag mentions in messages to Markdown-escape them
Merge pull request #159 from twbs/markdownish

Markdown-escape HTML tag mentions
grunt dist
prep for v0.7.0
grunt dist
add Release History entry for v0.7.0