Merge pull request #10 from algernon/f/sqlify/trim-more-spaces

oj/core.clj: Trim extra spaces in sqlify
Merge pull request #11 from algernon/f/group-by

Add a group-by generator
There were problems with booleans. Fixes #15
bump version
Simple SELECT aggregate implementation

This modified generators/sql-val to treat '(sum :price) specially: the
first member will be the aggregate function, the rest, the parameters.

SPEC updated, and a test case added.

This fixes #1.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>