Add DEFAULT_RETRY_OPTIONS

Add a DEFAULT_RETRY_OPTIONS constant and code to override it in the case
a custom value is set.
Increment the version to 0.9 and set to beta.

Getting close to stable and 1.0 release.
Merge pull request #93 from beaulyddon-wf/kick_to_version_zero_nine

Increment the version to 0.9 and set to beta.
Merge pull request #92 from tannermiller-wf/default_retry_options

Add DEFAULT_RETRY_OPTIONS