Fixed example implementation.
Gave functions more useful return values.

Also improved the comments.
Removed unused variable, fixed comment.
Added some basic tests.

They don't work -- I overwrite insert.go by accident so most of
yesterday's work is gone =[.
Combined Locate and Contains into one function.

Otherwise you end up calling them one after the other in an
inefficient manner.
Merge branch 'master' of github.com:scpayson/insert

Conflicts:
	insert.go