bump version to 3.5.0

Add MLB plugin

Fix websocket disconnection

v3.0.0

* Fixes encoding issues in all affected plugins
* lots more tests

Add Sqlite, split lib and bin, add log

* Version 3.0.0a1
* Split slask.py into a binary and a library
* Move library code into a slask/ folder
* test binary (lightly, needs filling out)
* add a makefile with run/install/test tasks
* move plugins to slask/plugins
* add pluginpath option to binary so plugins can be loaded from any
  directory
* remove config.py.sample and wsgi.py

The v2.0 branch of slask will be the last with `slask.py` in the root