Features added

# Added support for TSLint. (Issue #432) 

We need to:

* Add TypeScript save listener. Currently, tslint is running via menu item only.
* Add settings in global `.tslintrc`(https://github.com/palantir/tslint/issues/56).


# DropImage to cause formatting dialog. (Issue #442)

We need to capture collection of dropped images and for SmartTag.