Merge pull request #1 from t6/master

Add text/plain to supported mimetypes
stylesheet bug fixes #2
more stylesheet stuff
Merge branch 'master' of https://github.com/martinring/clide2
include scala.pickling
bump play and akka versions up
unified project structure
append :)
cleaning up
show annotation streams
annotation position extractor
extend document model
fixed conversion bug
add warning messages on unhandled msgs
akka kernel plugin
rudimentary output for isabelle via chat
some enhancements
use port 0 as default for connected systems
remove unused code + annoying logs
started updating readme