- Improved ES6 support.

- Allow overriding default plugins via .jsfmtrc config file.

- Improved error reporting: log errors to stderr and more consistent exit status codes.
- Better es6 support through upgraded dependencies: esformatter, esprima and escodegen.

- Upgrade esformatter to `0.5.0`.

- Use process.stdout.write instead of console.log to avoid outputting extra newline
- Utilize esformatter-var-each to format vars on individual lines.

Merge pull request rdio#114 from jimfleming/v0.4.0-PR

Updating changelog and release version

- Adding support for `UnaryExpression`

- Fixing bug where rewrite types were not being set properly

- Fixed bug when searching for expressions within BlockStatement or P…

…rogram body

- Added JSON support

- Added CONTRIBUTING

- Added tests
- Added Gruntfile for development
- Added CI support
- Added style guide
- Added default formatting config
- Exposed getConfig api method for loading jsfmt config
- Exposed format(js[, options]) api method for formatting
- Added --validate option and exposed validate api method
- Pinned dependencies

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