improve Spring.GetKeyBindings
remove dead code & cleanup
catch keypress in /groupX only when there is a group bound to the num
add KeyChains (or KeyModes, KeyChords, how ever you want to name them)
this solves pullrequest #90 in a slightly different way
syntax is now as follows:
bind Ctrl+1,Ctrl+2 say Hello
bind Ctrl+e,Ctrl+e say World!

this simplifies the code a lot and makes it easier to maintain.
add an example KeyChain (double press [`] to put label)