Umapi-client

Enhancement release:

* [Issue 32](https://github.com/adobe-apiplatform/umapi-client.py/issues/32)
* change timeout default to 2 minutes
* add retry after timeout.
* change default create behavior to "ignoreIfAlreadyExists"
* (No issue)
* fix misspellings
* change .gitignore so that .gitignore is not ignored

Enhancement release:

* [Issue 30](https://github.com/adobe-apiplatform/umapi-client.py/issues/30)
* Add control of user-agent header.
* (No Issue)
* Add this HISTORY.md file to summarize releases
* Add version.py file to synchronize version between setup and module.

Fast-follow bug fix release:

* [Issue 27](https://github.com/adobe-apiplatform/umapi-client.py/issues/27)
* Update parameter names were incorrect.
* Test mode wasn't working.
* [Issue 28](https://github.com/adobe-apiplatform/umapi-client.py/issues/28)
* Reuse existing open connections across calls.

First release with functional wrapper and built-in throttling/batching.