The simplest program, read a single button on pin PB_4

Dependencies:   Hotboards_buttons mbed

Revision:
0:61fb1e77eaee
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Thu Mar 03 19:50:53 2016 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/87f2f5183dfb
\ No newline at end of file