removed create_event from clEnqueue* functions. Event is created in create_command()
moved POCL_UPDATE_EVENT_QUEUED to pocl_command_enqueue()
Removed POCL_UPDATE_EVENT_QUEUED from couple of clEnqueue* functions. Separated runtime tests to their own test items
Merge pull request #54 from vkorhonen/master

Improved event creation and adding commands to the command queue. Runtime tests separated to their own tests