Add raw filter

See: https://groups.google.com/forum/?fromgroups#!topic/joomla-dev-cms/U_-u9wECKx8
Fix missing space
Sync to Platform 12.3
Merge pull request #185 from wilsonge/patch-1

Add raw filter
Some tests
Merge pull request #208 from wilsonge/rawtests

Some tests for the raw filter
Merge pull request #207 from piotr-cz/sync_JImage

Image package synced to Platform 12.3
Sync coding-standards repo
Merge pull request #209 from mbabker/cs-sync

Sync coding-standards repo