Find tests when 'scala' is in the directory structure

If the project is in a directory structure that includes the path
'scala/' (ie /dev/work/scala/project) the previous code became
confuddled about the class name.
Allow use of ScalaTest runner

Set "use_scala_test"="true" in ScalaTest.sublime-settings to use the
ScalaTest runner instead of the JUnit runner
Merge pull request #1 from p14n/master

Using ScalaTest suites instead of JUnit suites