added get_unit and test
Merge branch 'validate_unit' of https://github.com/mbarry02/coi-services into validate_unit

Conflicts:
	ion/processes/bootstrap/ion_loader.py
	ion/services/dm/utility/test/test_types.py
	ion/services/dm/utility/types.py
Warning message fix
Bumped ion-definitions
Merge branch 'master' into ooiload

Conflicts:
	extern/ion-definitions
Merge bumped submodules
Updated OOI preload to one level site model
Merge branch 'ooiload'
Reset correct submodule pointers
Enabled data product source association in DataProductLink preload
Added find_site_data_products to observatory MS
Adds test for testing pydap types (still needs improvement)
Fixes coi_pycc tests

XN and XP cleanup crashes subsequent tests and possibly exchange
management, I removed it in favor of using addCleanup and letting the
exchange management to cleanup resources appropriately in lieu of
explicit cleanup which violates the workflow (and crashes).
Merge pull request #914 from lukecampbell/test_fix

Fixes coi_pycc tests
Fixes discovery

raw_query in elasticpy is a static method and requires host and port to
be explicitly specified, which is why these two tests fail.
Merge pull request #913 from lukecampbell/pydap

Adds test for testing pydap types
Merge pull request #915 from lukecampbell/discovery_fix

Fixes discovery
Merge pull request #891 from lukecampbell/validate_unit

Adds unit validation pending udunitspy
Adds udunitspy to setup.py
Revert "Merge pull request #891 from lukecampbell/validate_unit"

This reverts commit 07682c121bb2ec9eb511d8abde1e07a75c02d183, reversing
changes made to a14ee948b867ee42df6cad117a79812b3c4e9a81.