Add MIT License

Closes #216
Create LICENSE
Move license to LICENSE

See #216
Change README headings to the correct levels

Level 1 for the title, level 2 for main headings, level 3 for subheadings.
Link to upstream Squiz.StringsDoubleQuoteUsage implementation, related to #235
fix whitespace
Merge branch 'master' of github.com:fulldecent/WordPress-Coding-Standards into develop

Closes #236

Conflicts:
	WordPress-Core/ruleset.xml