Delete legacy ActionExecutor, no longer in use
Add support for OOZIE_RETRY_MAX and OOZIE_RETRY_INTERVAL.

These allow SeqWare to control Oozie's user-level retry mechanism in combination with modifications to oozie-sge action executor in order to return error codes and designate certain error codes to retry.
Update documentation with .seqware/settings
retry-max and retry-interval is defined on the action, not the sge element
Update docs
Merge pull request #167 from SeqWare/feature/oozie_sge_retry

Feature/oozie sge retry