Added fetching of server version details.
Fixed / added doc blocks and PSR-2 formatting
Regenerated docs
Updated CHANGELOG
Updated version info
Removed Server interoperability and added link to interoperability matrix on wiki
Merge pull request #101 from frankmayer/devel

Some fixes, updates and docs generation for the 1.2.1 release of the client
updated ArangoDB Version for travis to 1.3-rc1 + test
Merge pull request #102 from frankmayer/devel

updated ArangoDB Version for travis to 1.3.devel
Merge pull request #99 from F21/server_version_details

Added fetching of server version details.
Disabled some tests because of missing statistics in ArangoDB 1.3
Merge pull request #105 from frankmayer/devel

Disabled some tests because of missing statistics in ArangoDB 1.3