test to show blind update of empty map causes AttributeError
test to show blind update of empty set causes CQLEngineException
Merge branch 'master' into update-with-empty-map
Can blind update a map column such that it becomes an empty map.
Can blind update a set column such that it becomes an empty set.
test for blind update of empty list
slight change to way blind update to empty handled in MapUpdateClause
fixing get_context_size for blind update to None in SetUpdateClause
slight fix to MapUpdateClause context size.  Fix MapUpdateClause assignment clause test.
A ModelDefinitionException is now thrown from the metaclass at model definition time if the model contains a column whose name conflicts with a built-in attribute or method.

(See https://github.com/cqlengine/cqlengine/issues/193)
The pip plumbing for the sure library seems to be horribly broken in 1.2.7, so I propose pegging to the stable version and getting the Travis tests working again.

See https://github.com/gabrielfalcao/sure/pull/60
Merge pull request #204 from maedhroz/sure-version-pegging

Use Stable Version of Sure Package
Merge pull request #203 from maedhroz/column-name-built-in-conflicts

Models With Fields that Conflict with Built-in Attributes
Merge branch 'update-with-empty-map' of github.com:Lifto/cqlengine into Lifto-update-with-empty-map
updated changelog