add Trip::Event#inspect
pause on method call, method return

the events "call" and "c-call" identify method calls.
the events "return" and "c-return" identify method returns.
rename Trip::Event#classname as Trip::Event#klass

the method name 'classname' could be misleading. the 'name' portion of
the method name might indicate a String but the method returns a Module
or nil.
add tests
less text in it() example blocks