This patch makes openssl the preferred source of random data on Windows and
will only use mcrypt_create_iv on PHP 5.3.7 and newer.

Fixes #771

and restarts PHP SESSION

Add cipher validator - checks to make sure the cipher is valid & available.

Only use 8 bytes (64-bits) for the IV data (salt) for the encryption keys,
except for Mcrypt, which requires you to query the specific length and use
it specifically.

Add test function - basic testing (will be replaced by real test suit)