Ant tasks for packaging

Adds ANT tasks for generating package. Needs to be updated to push the version number from a properties file to both the package task and the styles.css file.
Fixes images issue

Fixes copying images to the proper directory
Ignores the cache.properties file generated by ANT
Adds styles.css template

So there's only one place to bump revision numbers, this extracts the values WordPress needs for its CSS in to a properties files and builds the styles.css file in the build process. To build a new revision, simply bump them  in the  file.
Add support for tags

Adds support for tags in the styles.css file
Merge branch 'feature/package_system' into develop