SUPMRG-168: Updated all file doc headers.
SUPMRG-208: 
* [FIX] Added validation if empty on system config field 'general/country/hide_region' before processing
* Converted README into md-style
* Removed superflous data
Merge branch 'SUPMRG-208-empty-countries' into dev

Conflicts:
	build/app/code/community/Symmetrics/TweaksGerman/Model/System/Config/Backend/Region.php
SUPMRG-208: 
Updated doc header of Symmetrics_TweaksGerman_Model_System_Config_Backend_Region class.
SUPMRG-208: 
Added deprecate note of Symmetrics_TweaksGerman_Model_System_Config_Backend_Region class and intended tags in doc header.