v0.7.0

• Widens version requirements for scipy and numpy to make compiling dependencies from source less common
• Substantial improvements to documentation. Now using 'alabaster' theme and simplified examples.
• Adds '--test-prop' param to train_test utility.
• Adds a Dockerfile for building an image that will run an ipython notebook to build a revscoring project
• Adds a trim() function for reducing a feature_list to it's basic 'features' -- a prerequisite for https://github.com/wiki-ai/ores/issues/100
• Adds basic language features for dutch, german and italian

We've also fixed out CI process and added code coverage reports.