Can compile basic Nearley grammars

• Added compile_grammar function, which accepts Nearley grammars, as long as they are V8 3.14 compatible.
• Improved code coverage from unit tests

Skeleton repo/site created

• Created GitHub repo: https://github.com/coedl/tidylex
• Documentation to compile to GitHub pages site: https://coedl.github.io/tidylex/
• Automated building/testing with Travis CI: https://travis-ci.org/CoEDL/tidylex
• Code coverage reports with Codecov: https://codecov.io/github/CoEDL/tidylex?branch=master