Update connect() and crypto enable

Fixup un/signed mess, add support for decoding SHORT in binary protocol

Merge pull request amphp#31 from marcioAlmada/master

Fix connection pool recovery

Fix amphp#20 (leave read watcher open watching for close)

Also make tests more flexible (otherwise it tends to break with different mysql versions)

Allow arrays inside prepares for multiple equally named parameters

Immediately return after error handling

Fix session state decoding

Use (*SKIP)(*F) to avoid useless callback invocations