Adding prosper_version setuphelper

Adding a common utility so prosper projects can have sane and up-to-date version information. Also in this release, we have added handy readthedocs support for documentation!

• Added prosper_version modules for version finding. TYVM ccpgames/setuphelpers
• Added sphinx docs with napoleon autodoc support. See our docs at readthedocs.io
• Requirements now floating/latest: Please be sure to tag expected version in dependent projects
• Touched up README.rst to reflect style of other Prosper projects
• Removed unused functions from prosper_utilities
• Added custom exceptions support
• Improved webhook-message-fail case
• Updated Travis-CI test coverage to Python 3.6
• Updated test names to match style in other Prosper projects
• Added quiettest option for testing w/o spamming webhooks

TEST RELEASE - PLEASE IGNORE

Validating Travis-CI release validation with new versioning automation

TEST RELEASE - PLEASE IGNORE

Validating Travis-CI release validation with new versioning automation

TEST RELEASE - PLEASE IGNORE

Validating Travis-CI release validation with new versioning automation

TEST RELEASE - PLEASE IGNORE

Validating Travis-CI release validation with new versioning automation

TEST RELEASE - PLEASE IGNORE

Validating Travis-CI release validation with new versioning automation

TEST RELEASE - PLEASE IGNORE

Validating Travis-CI release validation with new versioning automation

TEST RELEASE - PLEASE IGNORE

Validating Travis-CI release validation with new versioning automation

Test bugfix: requests updated urllib logging

After recent failure on Travis, requests==2.17.3 broke the logging test. Templates have been updated to reflect new expected pattern.

• Adjusted TEST:request_logname to reflect new update from requests
• added -rx to test suite for more info on x-fail tests

OPTIONAL UPDATE -- working behavior has not changed

Fixing common_config in pypi package

Fixing setup.py sdist behavior to include common_config.cfg in prosper/common path.

• Added prosper/common/common_config.cfg to MANIFEST.in
• Removed common_config from package_data in setup.py