Merge pull request #24 from drocco-007/master

Fixed a bug in the test for propagating map exceptions
prep for 0.10 release

Change-Id: Ifce736e14ac1f6721b2188b4bcb8f78534faffd9
Signed-off-by: Doug Hellmann <doug.hellmann@dreamhost.com>
use item access instead of temporary dict when ordering extensions
add test instance factory for the base, named, and hook managers

The class method make_test_instance constructs manager instances using a
predefined list of extensions, rather than loading from entry points.
fix a reference bug when DriverManager finds multiple entry points
enabled extension manager test instance factory
driver extension manager test instance factory