Update Opauth.php

we only start session if it's not running, but we set $response no matter who stared the session
Merge pull request #53 from andrus7k/patch-1

Fixed a bug on dealing with existing session.
Change default value of $response from null to empty array

Line 246 produce warning: array_key_exists() expects parameter 2 to be array, null given...
Merge pull request #54 from dn23rus/patch-1

Change default value of $response from null to empty array
Trim the lines
Fixes the bug on custom stream options for serverGet(). Fixes #55.
update readme to point travis build icon to opauth/opauth
Merge branch 'master' of git://github.com/opauth/opauth
forgot to udpate one reference to travis
Merge branch 'master' into wip/1.0

Conflicts:
	README.md
	lib/Opauth/Opauth.php
	lib/Opauth/OpauthStrategy.php
	tests/Opauth/OpauthStrategyTest.php
	tests/Opauth/OpauthTest.php
	tests/Opauth/Strategy/Sample/SampleStrategy.php