Added a label for todoitem priority levels
Added functionality to priorityLevelLabel
Clicking on showDoneButton inputs 'display done' in inputField
Added a folder for logs for not polluting the root dir
Merge branch 'staging' into jin/gui
Change the alpha value (transparency) of the cell's background based on the task's priority level
Merge pull request #140 from cs2103aug2014-w13-1c/jin/gui

Views for priority levels and completed tasks