PEP8
Change licence to PSF
Merge master into v1
Support for Python 3 (used module six)
Updated setup.py
Run tests only once
Drop third param in where-like methods
Merge master into v1
Coding style
Big refactoring
 * Removed some unnecessary exceptions
 * Complete refactoring of base classes (Query, Feature/s)
 * No more dynamic doc messages
 * Everything in unicode
 * Type validation at properties, not somewhere in upper classes
 * And a lot of more
Merge origin/master into v1
Fixed setup.py
Values enclosed by single quotes
Possibility to specify offset without limit
Select for update
Allow turn off some select options (distinct, cache, ...)
Refactoring of select options
Fixed unicode problem
Refactoring of args parser
Removed unused where condition