removed set CLK code from sample
removed set CLK code from main sketch
removed duplicate print statements
fix: pass char array to update_display function

The Alarm callback are a function pointer that do not seem to get
the global buffer. we change update_display to fill in a buffer
passed from outside.
Merge pull request #6 from saurabh-ar/master

sms/gprs/DHT11 sample sketches
sample for SD card data logger
Merge branch 'master' of github.com:rjha/aws
added new sd-card sketch and SD library