Feature 90 user to new task

New validation added.
1. No whitespaces!
2. No other than New status without assignee.

CAUTION. Since we do not populate assignee yet, there is no way to put ask in other than New stage!!! If you want to temporarily disable this validation check, comment a line
(!((String) parentPanel.infoPanel.dropdownStatus.getSelectedItem())
						.equals("new") && parentPanel.infoPanel.listChosenAssignees.getModel()
						.getSize() == 0)) {

in the NewTaskButtonPanel and/or EditTaskButtonPanel.

P.S Some manual and automated tests added.