ve.ce.Surface
* Switched to using getSlice instead of getData in copy and paste handlers
* Added try/catch which attempts to build a transaction with the unbalanced data first, but falls back on the balanced data otherwise
ve.dm.*Node
* Added default style attributes (now used by ve.dm.NodeFactory)
ve.dm.Document
* Fixed bugs in fixupInsertions where parentType was being set with an object rather than a string
* Made use of getDataElement
* Added adoption capability so that inserting a</h1><p>b into <p>c[cursor]d</p> results in <p>ca</p><p>bd</p> rather than throwing an exception
* Renamed getBalancedData to getSlice, now retuning a ve.dm.DocumentSlice object
ve.dm.DocumentSlice
* Introduced new container for balanced data and a range of the original context - useful for copy/paste
ve.dm.NodeFactory
* Added getDataElement method, which uses default attributes to create a boilerplate version of a data element
ve.dm.Document.test
* Updated getBalancedData test to be a getSlice test
demos/ve/index, VisualEditor, test/index
* Added references to ve.dm.DocumentSlice
Change-Id: Id9269a29e51ca213508de8f155d3feec5e5b0774