crypto support

Implemented optional encyption support for mysql session store in
accordance with OWASP Session Management Recommendations when
working with sensitive information.

Ref: https://www.owasp.org/index.php/Session_Management_Cheat_Sheet#Session_ID_Content_.28or_Value.29
Merge pull request #17 from jas-/crypto

crypto support
bump version
Merge branch 'node-mysql-v2.0+' of https://github.com/mjeffery/connect-mysql into node-mysql-v2.0+

Conflicts:
	README.md
	lib/connect-mysql.js
	package.json