Added a share button

this closes #83
temporary solution for possible wakelock startvation in alarmsService
Refactoting of alarmsScheduler

this closes #88

	modified:   src/com/better/alarm/model/AlarmCore.java
	modified:   src/com/better/alarm/model/Alarms.java
	modified:   src/com/better/alarm/model/AlarmsScheduler.java
	modified:   src/com/better/alarm/model/IAlarmsScheduler.java