Update documentation
Fix ANALYZE parsing so that 'iteration' is valid in addition to 'iterations'
Fix create models bug
Fix initialize models bug that occurs when you create only 1.
Analyze parallelization possible.
Reduce number of writes/reads to disk when updating models.
fix model indexing
Add ability to load old style samples
fix z matrix
Fix plotting utils bug
Fix dependence probability
Merge branch 'release-0.2.0' of github.com:mit-probabilistic-computing-project/BayesDB into release-0.2.0
Remove spurious output message for create models.
Add full support for column lists.

Added SHOW COLUMN LISTS FOR <btable>
Added SHOW COLUMNS <column_list> FROM <btable>
Added AS <column_list> in ESTIMATE COLUMNS
Added FOR <column_list> in ESTIMATE PAIRWISE
Fix help message for estimate columns.
Fix estimate pairwise parsing bug
You can now SELECT <column_list> FROM...
Fix regression bug
You can now INFER and SIMULATE <column_list>
Drastically speed up infer by only inferring what's output.