Move api.js to index.js (+ separate entry points for presets)
Simplified bundling (but without custom excludes/includes)
Bring back in the stuff to support custom builds
Don't even try to modify sourcemap strings
Fix build tasks
Update and anchor devDependencies
Embrace non-enumerables (instead of regexin' them out)
Clean safe imports
Add test for uncovered code
Merge pull request #21 from webpro/dev

Upgrade devDeps & simplify gulpfile