Remove 'tile' packaging check.

This allows the plugin to actually be used by other projects
to contribute a tile.

Fixes #15.

Change-Id: I650a26be7dc00181f6ad04fbf10099b1e535a35b
Added support for resource filtering

A tile.xml file can now include such things as @project.version@
and be replaced with the current project values if
<filtering>true</filtering> is configured. This defaults to false.

This will ONLY replace @var@ references inside the tile.xml.

Change-Id: If3bfc6a10c3299b76e3e78299fe5f8faf191cd88