Removed namespace sniff.

It's no longer valid since Cake 3.0 now follows PSR-4
Merge pull request #64 from ADmad/remove-namespace-sniff

Removed namespace sniff.
Update changelog and bump version number.
Fixed operator spacing sniff.

It incorrectly flagged code like $arr = [-1]; as erroneous.
Merge pull request #66 from ADmad/bugfix/operator-spacing

Fixed operator spacing sniff.