Issue #647: Correctly match resource directories.

This updates the PackageResourceLoader so that it correctly excludes
directories that aren't the standard resource directories.  This is necessary
in case a path is configured like:

android-menudrawer/menudrawer/res/values/attrs.xml

It would incorrectly in the past try to include attrs.xml in as part of the
MenuLoader parsing becuase it contained "menu" in the path name.  This patch
appends the "res/" to the folderBaseName passed to the resource loader to
limit the scope further.
Merge pull request #648 from NineWorlds/issue_647

Issue #647: Correctly match resource directories.
Initial rework of current README content
Add pom dependency and syntax highlighting
Add code sample and note about android maven plugin
Seeing code is believing
Header of the readme was too big
Tweak code sample
Add blurb