Pass context to conditon plugin in condition expression.
Added test case for condition context definition passing, fixed phpunit improvements suggested by fubhy.
Merge pull request #41 from klausi/condition-expression-2245049

Pass context to conditon plugin in condition expression.
Merge pull request #43 from fubhy/add-string-translation-mock

Added string translation mock to condition test base class.
Added unit test for 'Path has alias' condition.