boyan.codemirror.editor improvements

Ported parts from not-plugin-based branch
Now CodeMirror will
CodeMirror settings(indentUnit, tabSize and others)
boyan.bootstrap.tab-manager added context menu

Ported context menu from not-plugin-based branch to
boyan.bootstrap.tab-manager
boyan.bootstrap.file-tree improvements

boyan.bootstrap.new-project-dialog improvements