Add $ and _ specs for isTopLevel method
Modify for version specs
Update scripts for Travis-CI
Rename global variable to avoid effecting IDE tips
Change window to global for Node.js
Refactoring scripts for Node.js
Improve plugin-text to support node environment
Add module and require for compressing
Improve code for plugins
Make plugins runnable in node environment
Modify specs for node environment
Modify runner for node environment