Merge pull request #3 from FichteFoll/master

Bugfixes and cleanup
Update README for package control
Add contributor section to README
Make things more ST3 friendly
The preferred escaping method for CDATA tags does not work,

instead use a hack with an undefined variable which ST will replace with ''

See SublimeText/UnofficialDocs#29.
Fix for ST3
Merge pull request #5 from FichteFoll/fix_cdata

Fix CDATA tags and update for ST3
Fix highlighting of nested complex patterns (e.g. `${1:param=${2:None}}, $3`)