Add precompiler/compiler subargs options w/ tests
Add precompiler/compiler options to readme
Remove unnecessary try/catch
Merge branch 'knownasilya-pre/compiler-subargs'
Changelog entry for 2.1.0
Release 2.1.0
Document package.json usage

Documents how to configure the transform using the package.json file.
This was actually requested in #25 but as it turns out Browserify
supports this directly.
Allow sending options to the precompiler

```
configure({foo: 'bar', precompilerOptions: { knownHelpersOnly: true, knownHelpers: {myUltimateHelper: true}})
```