Open source Tapestry plugin

Hi,

I've been trying to make some changes to the open sourced tapestry plugin intellij-plugins/tapestry at master · JetBrains/intellij-plugins (github.com) in order to submit a pull request, but I can't seem to get it to build. Steps to import and use the project:

1. I've opened the project through IntelliJ ultimate

2. Used the IntelliJ community source as my SDK

3. Imported some of the missing dependencies through the jars provided in the IU version.

I am, however, receiving a few errors in regards to some `@NotNull` annotations and a few other constants. Is the tapestry plugin not in a buildable state? If it is, is there something that needs to be done before one can build it?

Thanks.