Provide default cache config for unittesting APC and File drivers

Since 1fdb7e3c10 the module does not provide any default
config, so cache driver tests were mostly being skipped.
Provide default configs within the unit tests so that these
tests can run.

Previously, the APC test was not checking for existence of
the config causing travis build failures on HHVM (where APC
is installed by default) but passes on other PHP versions
because APC is not present.
Merge branch '3.3/master' into 3.3/develop
Configure standalone travis build for kohana/cache

Adds and configures kohana/koharness to build a skeleton Kohana
application and then uses that environment to run the unit tests
on travis (and locally, if required).

Continues kohana/kohana#50
Disable IRC notifications for kohana builds
Merge pull request #51 from kohana/3.3/feat/travis-module-build

Configure Koharness for standalone Travis build
Add travis build badges to README

[skip ci]
Update travis, composer and koharness config for 3.4 series
Merge pull request #56 from kohana/3.4/feat/travis-module-builds

Add standalone build for 3.4 series