Add timeSpent and timeSpentSeconds to TimeTracking
Merge branch 'master' of https://github.com/rcarz/jira-client

Conflicts:
	src/main/java/net/rcarz/jiraclient/TimeTracking.java
	src/test/java/net/rcarz/jiraclient/TimeTrackingTest.java
	src/test/java/net/rcarz/jiraclient/Utils.java