tests

Prevent adding samples to a locked sample type #572

Job	Run time
Tests (mysql, rails test test/unit)	25m 28s
Tests (mysql, rails test test/functional)	34m 32s
Tests (mysql, rails test test/integration)	18m 6s
Tests (mysql, rspec spec)	3m 5s
Tests (mysql, rake assets:precompile)	3m 32s
Tests (mysql, rake db:setup)	3m 22s
Tests (mysql, rake db:migrate)	3m 50s
Tests (mysql, rake seek:upgrade)	3m 28s
Tests (sqlite3, rails test test/unit)	20m 4s
	1h 55m 27s

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