Make Connect show through help from inner class

The redirection seems a faff when wanting to quickly look things up while working with pymysql. Grabbing the doco from the inner class (which should always be correct given it is a passthrough) should give a nice link. 

I've removed the "_orig_conn" from the local namespace (del never deletes anything, it just removes that name/ref for it). This keeps it from fouling up the dir(..) output.
Merge pull request #133 from dannystaple/patch-1

Make Connect show through help from inner class
Fix syntax error with invalid string constant.
Restore python 2.7 compatibility.
Use the right import
Merge pull request #135 from NextThought/master

Fix __init__.py syntax error and importing under Python 2.7
added commit() to execute()

added commit() to execute() as this seems to be key to making the actual query happen.
Bug fix: Encoding before escaping

The query is now encoded after it has been escaped
Merge pull request #1 from Tyrfing/patch-1

added commit() to execute()
Merge remote-tracking branch 'seoester/master' into PR143