Add Tsx Support

[zarakay]

This pull request adds tsx support to this gem. The tsx file extension is used by typescript to signify that the file contains JSX syntax and to compile accordingly. The merge of this depends on typescript-ruby/typescript-node-ruby#11 being merged first.

[coveralls]

Coverage decreased (-2.8%) to 88.06% when pulling 31c11df on OzGuild:tsx-support into 2c8c006 on typescript-ruby:master.

[bdrazhzhov]

Hi @mliyanagamage
Could you cover your changes by tests to ensure that these changes recognise new file extension correctly? Also it would be useful for new changes in future, test should help not to break your code.