Use hostname instead of host when connecting to endpoint in XHR

Fixes #195
Set max listeners to 0 on SSL agent's event emitter object

Avoids "memory leak" warnings when lots of requests are sent from
multiple service objects sharing this agent.
Update config.js

Updated doc for `httpOptions.timeout` to reflect documentation from  http://nodejs.org/api/net.html#net_socket_settimeout_timeout_callback which is used internally to set the timeout.
Update EC2 API version to 2013-10-15 (backward compatible change)
Add NextMarker as output parameter in ListObjects operation
Removed required traits on some AWS Support operation inputs
Merge pull request #197 from seangarner/patch-1

Fix for #196 - Update config.js
Update supported API versions in README
Merge branch 'master' into release/v1.14.0
Bump version to v1.14.0