ST3 Compatibility Patch, added HTMLBeautify to Command Palette

Hey there,

great work on this plugin, I really enjoyed it in ST2.

Just a small fix to make this plugin work in SublimeText 3. sublime.Region requires two INT and it seems like the new python is more restrictive.

Make sure to update your package entry on (https://github.com/wbond/package_control_channel)

At the moment, its marked as ST3-Incompatible (https://github.com/wbond/package_control_channel/blob/master/repository/h.json#L630), 
you could update the line to "sublime_text": "*" to make it available for ST3 users.

Thanks!