[WIP] Fixer that converts old style constructors into __construct()

Please share your thoughts on this fixer.

I need to implement ignoring of oldstyle constructors in namespaced classes (added in PHP 5.3.3), and the fixer should be done.

I'm wodndering if there are some more rules that i should consider in this fixer?
Please add a test that guards if this fixer will be run after VisibilityFixer.
If it indeed neds to be run after it.