Add default stats dir.
Merge branch 'master' into stats-dir
WebServer and ExecServer creates statsdir on start-up if it doesn't exist.
Merge branch 'master' into stats-dir
Update unit build.xml to build all test projects.
Remove unused azkaban-svg.less and move azkaban-graph.css to less.
Clean up CSS styles for flow job list tree view.
Change auto pan zoom checkbox into toggle button.
Print cause of InvocationTargetException when trying to load plugin.
Save absolute path of stats dir.
Improve appearance of main page flows list for projects.
Merge pull request #106 from davidzchen/stats-dir

Default stats dir and some UI improvements