Send ERRCHAR token to parser for unrecognized char. Also make WS go to parser on hidden channel not real token so we can reuse grammar outside of intellij.
Merge pull request #22 from parrt/master

Send ERRCHAR token to parser for unrecognized char. Also make WS go to p...
collect PSI search stuff into one place, add comments
Merge pull request #24 from parrt/organize-tree-search

collect PSI search stuff into one place, add comments