Ignore test-generated files
Add sean font as a submodule for testing
Add sean_hairline to the set of test fonts
Add a precision argument to export command, to fix issue #127

Rewrite test script to use rounding for consistent comparison of results

Needs ufoJS pull request #8 to work
Update ufoJS
Merge pull request #137 from rrthomas/testing

Testing
Make cps-selectors command take a real typeface
Make naming of selectors argument more consistent
Non-functional skeleton of an interpolate command
Take into account comments from @graphicore

Don't use for...in for array iteration

Don't store return value of project.open, as it's the same each time for the
same project.

Don't expect the code to work yet as a result of these changes!