Fix regression introduced by camera fix.

Pull request 119 https://github.com/FlixelCommunity/flixel/pull/119 fixed issue #50, but it introduced a new bug related to the camera bounds. This commit reverts all changes made by pull request 119, fixing the introduced FlxCamera problems.
Merge pull request #171 from Dovyski/fix_issue_165

Fix regression introduced by camera fix.