updated datastructures
Pr*.java added Method to append single items, BasicInfo.java: changed visabillity from attributes from private to protected
PrException: created Exception for throw out of code due to forbidden method call in Subclasses of ProjectItem; Modified Datatypes as subclasses of abstract superclass ProjectItem
moved ProjectItem to PrItemSupertype and changed references in Sources
merged featrue-datastructures to develop
imporved datastructures. now datastructures needed to be castest to thier special type in specific view
updated datastructures and merged to develop branch
merged mail notification
fixed calendarcanvas and adapted labels in file menu
first prototype for deadline drawing done
small imporovements
resolved merge conflicts
updated PrPerson
changed column name in main_index.csv from "information" to "description"
Merge branch 'develop' of https://github.com/se-2014-2015/semesteraufgabe into develop
added OAuthv2 authentication when sending emails