improve documentation and fix spelling errors
use JSON capitalization consistently
SpecTransform -> SpecDriven in readme
use isEmpty() instead of size() == 0
Merge pull request #72 from norbertpotocki/small-improvements

Small improvements
README typo fix
Merge pull request #75 from bvtreyperry/master

README typo fix
Merge pull request #69 from norbertpotocki/documentation

Documentation improvements