Merge pull request #41 from dkundel/master

Necessary changes for CoCo
Release 0.1.17
Fixed bugs handling invalid code.
Release 0.1.18
Added some globals to options.
Release 0.1.19
Closes #45: Add code coverage reports with grunt-instanbul
Added noSerializationInFlow option
Big refactoring for 0.2.0; each source language now has own module, globals make sense, UserCodeProblems are plain objects, and some options have been removed.
Merge pull request #46 from dpen2000/CodeCoverage

Closes #45: Add code coverage reports with grunt-instanbul
Merge branch 'master' of https://github.com/codecombat/aether
Release 0.2.0