Update dependency version of jscs to 1.5.2
TextOM is no longer a function, but just an object (fixes #4)
Modified unit tests, due to changes in a63b814
Modified documentation, due to changes in a63b814
Refactored `Node.isImplementedBy()` unit tests (fixes #2)
TextOM now exports a SourceNode (fixes #3)
Modified unit tests, due to changes in e4c3957
Modified documentation, due to changes in e4c3957