add match and beDefined
add beDefined example to readme
add beDefined and beUndefined
add beNull
add beTruthy and beFalsy
add beLessThan, beGreaterThan
change example of addTest since we now provide beLessThan out of the box
add links to tests
rearrange readme sections
remove comments
update version
Merge pull request #4 from reergymerej/more-tests

More tests