Add generic per-type rendering, implement ARRAY

Add generic per-type rendering, implement ARRAY

Fixed bug expanding upon the fix for
:ticket:`85` which adds the correct module import to the
"inner" type for an ``ARRAY`` type, the fix now accommodates for the
generic ``sqlalchemy.types.ARRAY`` type added in SQLAlchemy 1.1,
rendering the inner type correctly regardless of whether or not the
Postgresql dialect is present.

Change-Id: I98ffbf95a88dc815404a2d1020b0e3e56742ca8c
Fixes: #442