Merge pull request #13 from sandstroh/halıtbranch

Halıtbranch
fixed dayView: now the activities container is also displayed if the day hasn't any assigned activities
Merge pull request #14 from sandstroh/sandrosbranch

fixed dayView
Fixed drag and drop:
- it's now possible to drag and drop several activities without the application crashing after the first commit
- it's now also possible to drag activities from a day to the parked activities
- and it's possible to drag activities from one day to another
Started changing the add new acitivity dialog:
- the idea is to use this dialog for adding new activities and for editing existing ones
- therefore an activity has to be passed as argument (if it's null -> add new activity, otherwise edit the given activity)
Merge pull request #15 from sandstroh/sandrosbranch

Fixed drag and drop:
Added library to sort lists with drag and drop
Fixed moveActivity(...) function in the model
Started implementing moving of activities inside a day with drag and drop
Merge pull request #16 from sandstroh/sandrosbranch

Sandrosbranch
ParkedActivitiesView:
- fixed one TODO, that the controller listens only for events of elements that are inside the view
- added an option to delete a parked activity. The 'X' to delete it appears if you go with the mouse over the activity.
Merge pull request #17 from sandstroh/sandrosbranch

ParkedActivitiesView:
ActivityDialog:
- completed the dialog such that it can be used both for add new activities and edit activities
- extended the model with a function to edit parked activities
- fixed listener in ParkedActivitiesController: on button click -> add new activity dialog, on double click on activity -> edit activity dialog
Merge pull request #18 from sandstroh/sandrosbranch

ActivityDialog:
Small bug-fix in the ActivityDialogView:
- if the dialog is shown as an 'Add new activity' dialog, the dialog wasn't resetted, i.e. the fields name, length, type and description could possibly have the values of another activity that was edited before.
Merge pull request #19 from sandstroh/sandrosbranch

Small bug-fix in the ActivityDialogView:
Fixed moving parked activities with drag and drop
Merge pull request #20 from sandstroh/sandrosbranch

Fixed moving parked activities with drag and drop
Added 30%-breaks line to the CanvasView
Nice moving of parked activities with drag and drop.
Merge pull request #21 from sandstroh/sandrosbranch

Sandrosbranch