Starting a Conventions section for contributors.
Merge pull request #411 from ycombinator/contributing

Starting a Conventions section for contributors.
More samples around setting content types.
Using more efficient method to update content type (thanks @jamiehannaford!)
Merge pull request #413 from ycombinator/more-object-store-samples

More samples around setting content types.
Adding convention for argument validation.
Merge pull request #414 from ycombinator/contributing

Adding convention for argument validation.
Adding sample code for creating a server and retrieving its IP address.
Merge pull request #416 from ycombinator/compute-samples

Adding sample code for creating a server and retrieving its IP address.
Merge branch 'working' of https://github.com/rackspace/php-opencloud into working
Merge branch 'working' of github.com:gecampbell/php-opencloud into working