Bug 1027646 - Add more alternative keys to LaTeX
Bug 1027646 - Add alternative arrows
Bug 1027646 - Fix sets
Bug 1027670 - Add IME that handle LaTeX
Bug 1027670 - Improve LaTeX IME source code

- Avoid enumerate compositeKey
- Improve jumps and backspace
Bug 1027670 - Add Period handler
Bug 1027670 - Fix insert composite key
Bug 1027670 - Fix regex for jumps