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Added variable selection capability.
Add new Main Menu, basic interface.
Resolving merge conflicts.
Refactor toolbar items to transition better between states

Bar button items now behave within a state machine, with
a helper class (ZSCanvasBarButtonItem) for generating
items and blocks for event handling.
Editor changes
Resolving merge conflict.
Fixing storyboard.
Changing height in storyboard to reflect retina display and removed orphaned statement chooser view controller.
added long press to delete a statement
added long press to delete a statement
Removed ZSSettingsViewController and added a zuseGreen for the play button.
Merge branch 'master' of github.com:ZuseApp/zuse-ios
Resolving merge conflict.
Adding example code for presenting view controller.