Escalator: Return keys as strings in Range
Add b and u helpers to utils
Escalator: Accept unicode for keys
Accept unicode entries names
Accept unicode session name
Accept unicode setup.json filename
Use 'u' helper to parse the manifest
Plug: Fix unicode error with Thread.name

The Router and the Dealer were inheriting from Thread
and overriding the Thread's name via self.name. But
a Thread can't have an unicode name, so it was causing
issues with the lasts changes.

Now the Router and the Dealer are objects and their run
method is started in a new Thread by the Plug.
Fix #62: bug when sharing a db with Python 2 and 3
Tests: Read unicode log lines correctly
Tests: Accept setups with unicode
Fix test_startup on Python 2.7 with unicode setup.
TestDriver: Accept unicode entry name
Add several tests for unicode
Local Storage: Fix unicode related issues.
Fix unicode support of the API
Add some unicode to the API tests
Fix prefixed databases
Fix prefixed database with unicode session
Fix prefixed databases with unicode prefix