Disable channel and email notifications; GitHub provides enough feedback.
Optimize git clone in CI script.
Use multiple script feature in CI.
Use env variables directly for CI.
Install mongo extension only when needed.
Enable xcache for CI only when explictly requested.
APC, mongo and memcached extensions are provided by CI env.
Separate opcode cache and DB tests in CI matrix.
Consolidate DB specific CI bootstrap files.
Adding build steps in CI depends.
Move PHP requirement in CI depends.
Use PHP_EXT in CI.
Refactoring CI depends to use one method per extension.
Adding ability to force version when doing pecl install.
Adding ability to install zendopcache in CI.
Adding commented default build in CI.
Exclude incompatible builds xcache/APC on PHP 5.5.

Removing obsolete method.
Bump xcache version in CI.
Reenable xcache with 5.5.
Whitespace.