ScriptService: add getScript(String,String) signature by imagejan · Pull Request #390 · scijava/scijava-common

I refactored ScriptServiceTest a bit to initialize the Context in a @Before method, and dispose it @After the tests.

@ctrueden what do you think about the re-use of the ScriptLanguage from ScriptInfoTest$BindingSizes? Should we instead make BindingSizes its own class within the tests? There are actually two nested ScriptLanguage implementations in the tests currently: ScriptInfoTest$BindingSizes and ScriptEngineTest$Rot13.