beginning queryset refactor with some basic statement and operator classes and a bunch of empty test files
adding where clause rendering
adding field listification
adding select field rendering
adding more select rendering and beginning dml statements
moving where rendering into it's own property
fixing str tests
adding tests around misc select statement rendering
fixing statement tests
adding a set clause
adding assignment statement base class
setting up constructors for other statements
adding deterministic context ids
adding test around adding assignments
adding test around adding where clauses
adding initial unicode rendering for insert statement
adding test around clause context updating
reworkign clause construction and test around assignment clauses
adding tests around insert statements and fixing a few things
Merge branch 'master' into query-refactor