Don't use local config in unit tests.

+ Define a constant in phpunit.xml.
+ Only set __CA_LOCAL_CONFIG_DIRECTORY__ when not in a unit test.
Merge pull request #25 from leftclickben/DontUseLocalConfigInUnitTests

Dont use local config in unit tests
WIP Add a dateAccuracyJoiner refinery

* derived from dateJoiner
Completed date accuracy joiner including tests
Merge branch 'dateAccuracyJoiner' of https://github.com/kehh/providence into dateAccuracyJoiner

Conflicts:
	app/refineries/dateAccuracyJoiner/dateAccuracyJoinerRefinery.php