Initial work on INTO
Merge branch 'master' into into

Conflicts:
	bayesdb/engine.py
	bayesdb/parser.py
Merge branch 'master' into into

Conflicts:
	bayesdb/engine.py
	bayesdb/parser.py
Resolving merge conflicts from dev branch
Updated parsing files and set up function to create new btable from existing one
Create table from existing is working up to the conversion of nan values
Fixed problem with numeric values going through _convert_nan
Remove row_id from data being used to construct a new btable from a select statement
INTO works with select, simulate, and infer
Added tests for INTO to test_client and test_parser
Added more thorough testing for INTO
Merge branch 'dev' of https://github.com/mit-probabilistic-computing-project/BayesDB into dev