Add version.py
Fix build scripts for post
Ignore conda version file
Merge pull request #857 from cpcloud/fix-build-number

Fix build numbers
Python2.6 support in windows is flaky
Merge pull request #860 from mrocklin/sql-aliased-views

SQL nested queries
skip postgres tests if credentials don't work

These credentials work on travis.ci.
They don't necessarily work on a user's local installation
Merge branch 'postgres-doesnt-fail-if-different-credentials' into sql-aliased-views
sql: memoize metadata reflection
expr: avoid repring expressions in _str