Update docs about version compatibility.
Add Hogan filter.

Hogan is a mustache pre-compiler that converts mustache templates into
executable javascript code. This saves compiling templates client side.
Update README.
Update travis.yml

The head of the repo is CakePHP 2.3+ only. Also test against 5.4
Clone the whole cakephp tree.
Remove odd bash operator.
Add missing doc blocks + fix property.
Clear the filesList when generating assets.

This fixes issues with themed assets. Generating the same asset with
different themes would result in the first themed file being included in
all output files regardless of the theme.

Fixes #149
merge upstream