Update underscorejs to 1.6.0
Merge pull request #376 from megawac/underscore

Update underscorejs to 1.6.0
[codemirror] adding 3.22.0
[codemirror] removing html files
[codemirror] removing more html files
[codemirror] re-running compression against 3.22 on codemirror.net
Merge pull request #377 from bollwyvl/codemirror/3.22.0

Codemirror 3.22.0