Stop relying on Measurable to determine source object.
Stop inheriting from Measurable.
Remove Measurable.
Whitespace.
Remove test for committing new Site/TGI/PopulationGroups

We don't generally want to add to the source of our synch, and this
test is failing due to an FK to the PHENOTYPE_MEASURABLE table we're
trying to stop using.  (We could bring the test back once the table
is removed... but it's probably not useful.)
Whitespace.
Use Synchronize::Classes version of sample.
Remove disused/duplicate LIMS subject hierarchy classes.
Merge branch 'master' into remove_phenotype_measurable

Conflicts:
	lib/perl/Genome/Site/TGI/Sample.pm
Merge pull request #55 from tmooney/remove_phenotype_measurable

Remove use of PHENOTYPE_MEASURABLE and related old Site::TGI modules