Merge pull request #2 from arnested/master

Included example of using allowUnusedFunctionParameters.

Merge pull request #1 from arnested/master

Allowed function parameters to be unused without provoking unused-var warning.

Add $argv and $argc to list of known superglobals.

Add support for compact() - literal string/array arguments only.

Fix error causing false-positive redeclaration warnings where use of late static binding constants as function arguments were being detected as static variable declarations on subsequent variable arguments to the function.

Add support for spotting static::$member_var outside class scope.

Add test case for use of late static binding static:: outside class scope.

Add array param to test cases for compact() support.

Add test cases for compact() support.

Add test cases to replicate failures where late static binding can be mistakenly confused as static variable declarations.

Correct the syntax of superglobals in double-quoted string unit test to one that is valid PHP.

Bump copyright year.

Detect pass-by-reference param declarations and do not issue unused variable warnings if they've been assigned to, as this counts as valid use.