Update TeXZilla to version v0.9.2
Fix license of Makefile
Use TeXZilla's ThrowExceptionOnError

Thanks to @fred-wang for the PR in @fred-wang/TeXZilla#27.
Avoid global variable

Thanks to @fred-wang.
Changes in JSHint

- Only use doble quotes
- Limite line number

**NOTE**: The are some long lines that are part of a JSON.

    $ jshint src/interface.js src/dialogs/interface.js
    src/dialogs/interface.js: line 60, col 89, Line is too long.
    src/dialogs/interface.js: line 101, col 90, Line is too long.
    src/dialogs/interface.js: line 102, col 126, Line is too long.

    3 errors
Update to TeXZilla v0.9.4
Improve in dialog window

Replace `div` with `p` in the preview.
Add release rule in Makefile
Fix ThrowExceptionOnError

In 0eee882 the use of ThrowExceptionOnError was incorrect.