added coverage tools and modified grunt bumper
Revert "added coverage tools and modified grunt bumper"

This reverts commit 01c69731a08ab5af03561bf923933ccad9c39c00.
added new test for #7
refined test for #7
Check functions are now always called

Check functions are not checked before backtracking, only when trying to
swap the arguments.

For #7
Release 0.10.2
updated home page