Don't need to add paren in _as

MoSQL does that already. Wasn't aware that it's already merged to master.
Make connection detection more robust
Remove empty tests.py
Add developing notes
Move __all__ to the top
Add fruits fixture
Implement our own functions
Implement repr and better iter
Fix db detection
Introduce order_by and group_by
Support subquery
Make test more explicit
A short intro in README