very large re-factoring. Moved antlr-intellij adaptor stuff to a separate adapter directory and changed package names.
 Commented the rule type logic in the lexer that indicates when the lexer is in a particular kind of rule, parser or lexer.
 Generally added comments around to identify the key components.
 Changed a few names to be consistent.
 Widespread changes but most of the changes are just package or name differences.
 The project file gets a new source folder.
 Tweaked the plug-in description xml.
Merge pull request #30 from parrt/reorg-rename

 very large re-factoring. Moved antlr-intellij adaptor stuff to a separate adaptor directory and changed package names.