asking if the button is released

Dependencies:   Hotboards_buttons mbed

Revision:
0:6346669b34d4
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Hotboards_buttons.lib	Mon Feb 29 20:56:59 2016 +0000
@@ -0,0 +1,1 @@
+http://developer.mbed.org/users/Hotboards/code/Hotboards_buttons/#810519ce94bf