Release v0.2.0

Release v0.2.0

• Support for the recast-based rewrite of esnext/es6-module-transpiler.
• The transpiler rewrite introduces formatters. The default formatter is an optimized bundle format, see: Transpiling to Bundle Format.
• Transpiling to CommonJS and AMD is still supported through formatters, see: Transpiling to CommonJS and Transpiling to AMD.

Special thanks to @ericf who did all the work!