Bump version to 0.7.4

Cleanup project files and bump version

Bump version to 0.7.2

Bumb version to 0.7.1

Merge pull request #16 from aipescience/adql-2.1

update to the final  ADQL 2.1

fix the order_by_clause for the dot-separated col references

minor changes to prepare the release

Minor fixes

fix setup.py bug

Change version number