Changes done in ECG and BT

Dependencies:   SDFileSystem ds3231 eeprom_Nikita mbed testUniGraphic_150217

Fork of merged_code2_20sept_2017_4th_oct_2017 by nikita teggi

Revision:
0:c47fb0c1bbf6
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ds3231.lib	Tue Dec 27 10:30:48 2016 +0000
@@ -0,0 +1,1 @@
+http://developer.mbed.org/teams/Maxim-Integrated/code/ds3231/#11630748e2f2