LowercaseConstantsFixer - rewrite to handle new test cases

LowercaseConstantsFixer - rewrite to handle new test cases.
Resolves #793.

May not work on php 5.3 yet
I see two options. Although one is radical. 

Deprecate support for PHP 5.3, which is already EOL. 

Or create some per level minimum required version. 

For sure,  we could put this case in Transformer, but we'd be loading the transformer module with a transformation used only in one fixer. 

More importantly, the introduction of new tokens is not trivial, take the case of T_POW, and you will understand what I mean. Transformers would need to make a complex analysis to glue together two * and make a fake T_POW.