Subscriptions now emit accepted (thanks avillaci)
Allow outgoing Subscriptions that expire in under 3600 seconds

This addresses:

  https://groups.google.com/forum/#!msg/sip_js/TshLqnjmjKY/uMXb6aihu3oJ

Note that RFC 6665 does not require subscriptions to last an hour, it merely
allows notifiers to reject subscriptions that are shorter:

  http://tools.ietf.org/html/rfc6665#page-18
removed old subscriptions on resubscribe
Add reminders to clean up Cordova metadata when possible
Update MediaHandler.js - Fix Chrome HOLD.

Fix the chrome hold by allowing it to fire the readySuccess() when connection state is completed, not connected (guessing this is a Chrome assignment issue?)
Merge pull request #88 from Destreyf/master

Update src/WebRTC/MediaHandler.js - Fix Chrome HOLD.
Merge pull request #86 from joseph-onsip/shortSubscription

Allow outgoing Subscriptions that expire in under 3600 seconds
UA: dedupe autostart logic into afterConnected method
UA#message uses UA#request
Session#refer: actually define originalTarget