Updates Code Sniffer to 3.X for PHP 7 Support

2.0.0

Updates Code Sniffer to 3.X for PHP 7 Support

made the variable name sniffer stop complaining about superglobals.

Merge pull request #8 from ve-interactive/fix/variable-names

:shipit:

fixed type hinting for array of objects

Merge pull request #7 from ve-interactive/fix/array-of-objects

Created the fix to have the correct comment type and type hinting for…

added the option to have null types in docblocks

Merge pull request #3 from ElvenSpellmaker/fix/add-null-to-internal-list

Adds `null` to the internal list.

Abstract classes and Interface rules

Added rules to check for suffixes and prefixes in abstract classes and interface.
Updated the license to MIT