package: update "browserify" to v5.11.0
dist: recompile
Release 2.0.0
Add version to package.json

Add version to package.json to work with license tools.
Merge pull request #135 from panuhorsmalahti/master

Add license to package.json
package: update "browserify" to v6.1.0
node: implement `DEBUG_FD` env variable support

Closes #146.
Release 2.1.0