Library building helper.

[tbranyen]

For those using this to generate a reusable library.

• [x] Automatically wire up start/end wrap.
• [ ] SourceMap support going back to original source.
• [x] Make identifiers pretty instead of mangled.
• [ ] Compile to CJS/ES6

[tbranyen]

Defaults:

• Output directory dist/
• Branch name release
• Tag name based off package.json version

[tbranyen]

Tracking in: https://github.com/tbranyen/synchronizer