Opencc Js Versions Save

1. Update opencc-data
2. Add ES6 module and add new features (#23)

1. Bump opencc-data to 1.0.7.

1. Fix a bug that the t option cannot be used

Fix performance degradation

1. Reduce file size

1. Update opencc-data to 1.0.6.
2. Re-designed the API to get rid of async. (See README for details)

Package with bundler

Use a better way to detect node environment. The old implementation fails at case of web workers.

Implement a feature: Ignore certain HTML nodes in conversion.

The conversion is skipped if the class list of a node contains ignore-opencc. All child nodes of the node will not be converted.