SciServer 1.11.0dev

This is a tag of a newly refactored SciScript. Not yet ready for full release. Tagging to mark before refactor sciserver#2.

Added:

• Global SciServer config
• Added invoke tasks to make docs build, cleanup, and pypi deploy easier

Changed:

• Major refactor:
  • converted to standard python package
  • added Sphinx docs and moved to readthedocs
  • made pip installable
  • made python 2/3 compatible
  • reduced boilerplate code
  • added general utils
  • converted tests to pytest
  • added to travis and coveralls