Introduce PSR2 compliance across src and tests
Install mocha
Create empty test bootstrap
Add Node.js test for capitalize filter
Replace all capitalize filter tests with Mocha tests
Replace one of the escape tests
Replace length filter tests
Replace nl2br tests
Replace def filter tests
Replace 'replace' tests
Get rid of the filter test HTML file
Make test descriptions consistent
Remove references to filter tests
Add support for the 'first' filter
Recompile twig.js