Minor change to __str__ method of Collector
Added pprint_label to Dimension object
Added Dimensional mix-in class to ndmapping file
Introduced Dimensional mix-in class and associated methods on Views
Added ScatterPlot to plots
Fixed collector auto-labelling
Fixed collector imports
Added str method on Dimension for pretty printing
Simplified Dimensional object, no longer requires constructor
Improved dim_range method (now works with string keys)
Added .info property to NdMapping
Introduced .value parameter on Views, simplifying .label
Improved docstring and sample/reduce signatures in views.py
Fixed titling bug in Stack
Made split_dim_keys method on Stack more robust
Fixed View lshift operator adjoin bug
Minor fixes to Stack and GridLayout
Made Layout a Dimensional object and fixed deep indexing
Made Data/Table Views/Stacks consistent with recent changes
Made operations consistent with recent changes