Merge GraphViewer code from spikesorting branch

Builds/MacOSX/Info.plist

Builds/VisualStudio2012/resources.rc

JuceLibraryCode/JuceHeader.h

Source/Processors/Channel.cpp

Source/Processors/Channel.h

Source/Processors/Editors/GenericEditor.cpp

Source/Processors/Editors/GenericEditor.h

Source/Processors/Editors/MergerEditor.cpp

Source/Processors/Editors/MergerEditor.h

Source/Processors/Editors/SplitterEditor.cpp

Source/Processors/GenericProcessor.cpp

Source/Processors/GenericProcessor.h

Source/Processors/Utilities/Merger.cpp

Source/Processors/Utilities/Merger.h

Source/Processors/Utilities/Splitter.cpp

Source/UI/ControlPanel.cpp

Source/UI/ControlPanel.h

Source/UI/GraphViewer.cpp

Source/UI/GraphViewer.h

Source/UI/UIComponent.cpp