Removing getUrl() declaration from abstract class since it is already defined in its interface.
Merge pull request #276 from ycombinator/working

[fixes #275] Removing getUrl() declaration from abstract class
Adding Version class for greater clarity
Fixing JSON schema bug with LoadBalancer access resources
Updating copyright year
Adding more graceful error handling for Container deletion; fixes #252
Merge branch 'working' of github.com:rackspace/php-opencloud into working
Adding more documentation for spawning instances with keypairs
Typo
Attempting to get around Travis/Github API rate-limits
Adding HHVM to Travis build matrix