Clean up cyanogen vendor

Inspired from jellybean/cm10.1 branch changes

Update to reflect:
1) CM .org changes
2) Fix 404 for Repo help and add in git help page
3) Moved device maintainers/translators to CONTRIBUTORS.mkdn
4) Fix reference to buildbots to point to Jenkins instead
5) Fix CM Wiki 404 error
6) Removed obsolete CHANGELOG file
7) Add myself as a translator for Greek language

Patchset 3 & 4:
8) Add phone vendor names
9) Sort phones & countries alphabetically

Signed-off-by: Michael Bestas <mikeioannina@gmail.com>

Change-Id: I553ef3baf8a37ddaa27f2c90190ee79990565378