merging into single app, see howto_run.md
first tranx simulator
racers site created and connected to servers service
adding new images
(cherry picked from commit 6f2158a)
bit more docs
(cherry picked from commit c07d900)
some more docs about Dart lang alternatives
(cherry picked from commit c9d663e)
Merge branch 'tranx' into simgleapp
Merge branch 'simgleapp'
link fix
Merge branch 'simgleapp'