Refactored: Move msysgit registry detection to it's own function

Signed-off-by: Sven Strickroth <email@cs-ware.de>
Detect msysgit installation of users without admin rights

Signed-off-by: Sven Strickroth <email@cs-ware.de>
Added Sven Strickroth to AUTHORS

Signed-off-by: Sven Strickroth <email@cs-ware.de>
Stick to coding style: Move up braces

Signed-off-by: Sven Strickroth <email@cs-ware.de>
Merge pull request #1299 from csware/support_local_msysgit_install

Support local msysgit installations