Features added

<h3> Added support for TSLint. (Issue #432) </h3>

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).

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<h3> DropImage to cause formatting dialog. (Issue #442) </h3>

We need to capture collection of dropped images and for SmartTag.