LPS-47030 Autocomplete support for multiple configurations 

Hey Nate, this is another piece in the autocomplete support for content. We now support multiple autocomplete configurations. You can test this out with https://github.com/natecavanaugh/liferay-plugins/pull/252

![autocomplete](https://cloud.githubusercontent.com/assets/905006/3172107/4362403c-ebd0-11e3-944a-23558102f439.gif)

![autocomplete_textarea](https://cloud.githubusercontent.com/assets/905006/3172147/c248242a-ebd0-11e3-9e54-74ae72d4a85e.gif)

/cc @ipeychev