Add missing HTML tags
Fix Save to CSS command

Closes appden/less.tmbundle#2
Update save command to work with lessc 1.3.0
Add Save to Minified CSS command
Add Insert inline Image drag command

Similar in fashion to https://github.com/cloudhead/less.js/wiki/Include-Data-URI-Base64-encoded-images-easily
Updated syntax highlighting to correctly highlight nested blocks of CSS/LESS

This may be because of the way I write my CSS/LESS, but none of the
branches of this bundle were correctly highlighting my LESS files. I
made some changes to the syntax to apply the correct CSS scope names to
the nested selectors.  Works for me!
Add some tags and properties
Add ms to vendor prefixes
Rely on TM_FILEPATH to get filename.
Add requiredCommands to locate lessc command
Change Save to… shortcuts to ⌘B and ⌥⌘B respectively.

To prevent overriding a standard shortcut.
Add scope to leading whitespace of a line comment
Simplify readme
Add menu layout and description
Add punctuation scoping
Match empty {} to allow proper ↩ behavior