add some orion tests - oracle thing
move disk units out to a separate file
StripeTarget
factor DMThinUtils out of ThinpMixin
StripedTests
Factor DMUtils out of ThinpMixin
define_tests_across
thin on striped tests
make the striped tests identical to Mikes test script
use define_tests_across to simplify cache tests
Start pulling a PoolStack class out of thinp mixin.

This isn't going anywhere, what we really need is a little dsl to
describe our stacks.

Also demote TinyVolumeManager to be purely about applying allocation
policies.
Metadata resizing tests
[rspec] math-utils tests
StringUtils::Emitter now raises a RuntimeError if undent is called too often.
rspec tests for StringUtils::Emitter
remove old TestUnit tests for Emitter and math tests
More MathUtils rspec tests
convert StringTable tests to rspec
rspec tests for DM::DMDev
split dm.rb up