-Change style for helpTheme
-added hotkey for scrolling up & down hashtaglist
-added hotkey for scrolling up & down tasklist
-Changed icon display
Merge branch 'master' of
https://xantoh@github.com/cs2103aug2014-t17-4j/main.git

Conflicts:
	task_catalyst/src/main/resources/fxml/quickGuide.fxml