Serbian translation

Serbian translation of Roots theme with Cyrillic and Latin scripts
(latin with KimmoSuominen srlatin plugin from wordpress-sr-sr version).
Show author display name in author archive.
Merge pull request #775 from lautreamont3/master

Serbian translation
Merge pull request #779 from Foxaii/author_archiv

Show author display name in author archive
Merge pull request #184 from retlehs/master

Pulling Roots commits