removed vagrant files for release, update README to suggest pre-built
binaries
minor edit to README
Merge pull request #327 from talumbau/vagrant_del

Vagrant del
use inheritance to test sqlalchemy types

Otherwise the dialect types aren't checked

TODO, make sure most specific type is chosen
Merge pull request #335 from mrocklin/postgres

use instance for sqlalchemy type checking
combining 'Distinct' with 'By' and column select shows some shortcomings
needed to add __slots__ to Distinct
expr: move count, distinct, nunique from column to table
python: column of column
expr: add TableExpr.iscolumn property
expr: TableSymbol.iscolumn keyword argument
compute: use iscolumn to resolve Distinct(column) issue
Merge pull request #339 from mrocklin/iscolumn

Add `iscolumn` property to TableExpr
Merge pull request #336 from mrocklin/into

Add `into` operation to api
table: add basic table object
expr: use toolz.merge in resources

used to point back to blaze.expr.table.merge
table: basic compute on exprs + Table
test constructors
data: discover operation
table: ducktyped inputs

Data is now anything on which we expect compute to work