Fixed $oldie issues, false works, calc fixed, added tests

Updated to 0.7 beta
- Removed $sens-oldie-default
- set variables to !default to allow sensible to be imported later
without messing up custom settings
- minq, maxq, minvq, maxvq all fully support true/false for reals this
time
- added tests.scss to make sure things work properly in the future
 - I'd like to stabilize around these mixins and argument orders to
prevent further breaking of the api (since its yet to remain standard…)
- old "false" trick should still work (see test case in minq)
- fixed dumb issue with calc where I didn't delete a hyphen so it didnt
do anything in Chrome