Add support for other JavaScript filetypes like javascript.jsx

It took me nearly 20mins to figure out why the JavaScript completion was not working at all when I realized that I set my JavaScript ft=javascript.jsx & it seems that in order for it to work it ft must be javascript only. It will be nice to support other filetypes too.

[maralla]

This commit #94 should fix the problem. Please update and try it again.

[maralla]

You can use the option g:completor_filetype_map to add support for javascript.jsx:

" In vimrc
let g:completor_filetype_map = {'javascript.jsx': 'javascript'}