Update change_bin w/ universal code for each type

Routine for each type is now at the head of the function leading
to standard dummy data sets for each type.
Also tests at the top of the function were checked to ensure they were
doing what they were supposed to. I am about to test the function
within the package now.
Add test for names of bin_vector in change_bin
Add case file for B0 in test folder.
Update documentation