added scheduler logging
fixed executor manager isFlowRunning not checking projectId bug
moved log cleanup thread to executor, added upload time to execution_logs table and adopted a much simpler clean method
add execution_logs_retention setting
display proxy users on ui
fix set sla checkbox values
fix scheduler use too many connections
remove annoying sla success messages
Integrated new ui with scheduler. Looks like I'll have to make more changes.
Merge branch 'master' of github.com:azkaban/azkaban2 into pipelineui

Conflicts:
	src/java/azkaban/executor/ExecutorManager.java
	src/java/azkaban/scheduler/ScheduleManager.java
	src/java/azkaban/webapp/servlet/ScheduleServlet.java