Stop manipulating line/column numbers

Traceur already corrects for 0-index line and 1-index column numbers,
so this shouldn’t be doing it too.
Merge pull request #17 from christianbundy/line-column-numbers

Stop manipulating line/column numbers
Use a DRY regex

Completely trivial, but it’s easier to use a positive lookahead and
replace `next` with `now` rather than replace `.next.js` with `.now.js`.
Merge pull request #19 from christianbundy/dry-regex

Use a DRY regex
Use + to denote version metadata

In accordance with rule 10 from Semantic Versioning 2.0.0
Add tests

This commit adds tests to make sure that Harmony is present, compiled,
and variables are shared between files and versions of ECMAScript.
Merge branch 'master' into fix-traceur-meteor-bugs