Reverted padding bit op.

git-svn-id: http://crypto-js.googlecode.com/svn/branches/4.x@653 eba437e6-77a4-11de-b799-7765b5330b87
Cosmetic.

git-svn-id: http://crypto-js.googlecode.com/svn/branches/4.x@654 eba437e6-77a4-11de-b799-7765b5330b87
Cosmetic.

git-svn-id: http://crypto-js.googlecode.com/svn/branches/4.x@655 eba437e6-77a4-11de-b799-7765b5330b87
Cosmetic.

git-svn-id: http://crypto-js.googlecode.com/svn/branches/4.x@656 eba437e6-77a4-11de-b799-7765b5330b87
Optimized performance, and other cosmetic changes.

git-svn-id: http://crypto-js.googlecode.com/svn/branches/4.x@657 eba437e6-77a4-11de-b799-7765b5330b87
Cosmetic.

git-svn-id: http://crypto-js.googlecode.com/svn/branches/4.x@658 eba437e6-77a4-11de-b799-7765b5330b87