Add rightscale.api.RightScale.find_right_script() method.
add simplejson requirement
Working rightscale.server_array.Execute actor (missing actor tests).

Unit tests and API methods are all built, but the actor tests are still
TBD.
one more bug fix to the build system
rightscale.server_array.Execute actor unit tests
Execute actor README
Only return True if all of the task executions succeed.
Remove debug print statement.
Begin/Finish execute() log entries shoudl be set to INFO.
Merge pull request #10 from Nextdoor/rightscale_execute_actor

Rightscale execute actor (issue #8)