Mostly-completed (not 100%) GSS example.
Change the way models are stored on disk: each model gets a separate .pkl now, in the models folder
Add ability to get single model at a time
Write and overwrite models one at a time, and get the max model id by examining file names.
Merge branch 'release-0.2.0'

Conflicts:
	docs/examples.rst
Optimize estimate pairwise, and add plumbing for connected components
Connected components working, and fixed a nasty bug in estimate pairwise for columns
Add BayesDB Error framework, and fix output extra line.
Add BayesDB errors to cover column parse errors, and clean up BayesDB error handling.
Fix bug in connected components
Add more error message coverage
Fail when trying to use a column list that doesn't exist for estimate pairwise
Update starcluster plugin to install the requirements for BayesDB master branch.
Fix ubuntu install script and update requirements.txt
Support windows newline format in csv
Use csv reader instead of .split('\n')
Remove unecessary csv read
Finally kill off windows-newline bug
basic implementation of pairwise for all data types. mult x cont not implemented.
Raise BayesDBError instead of Exception