documentation: unified descriptive text for boards
copyriot: fixed copyriot header for arm_common
cosmetics: cleaned up arm_common.h

* converted tabs to white spaces, fixed indentation, and removed SVN clutter
documentation: unified descriptive text for cpu
cosmetics: converted tabs into spaces for lpc1768 header
documentation: unified descriptive text for drivers
Merge pull request #1229 from OlegHahm/description_unification

Unification of descriptive text of similar modules