Cleanup: Rename isblank to is_blank and convert to property
Cleanup: Reposition method
Cleanup: Alter test to not depend on getouput method

This might allow to get rid of that method if necessary.
Cleanup: Use the @ syntax for some properties
Register INI dialects using decorator
Register properties dialects using decorator
travis: test against our minimum versions
travis: show what is installed in the virtualenv
req: create min-required.txt in complex version case

E.g. properly strip:
>=1.0,<1.6 --> ==1.0
>=1.0,!=1.0.1 --> ==1.0
req: export non-versioned requirements to min-required.txt