slicker eats end-of-line comments

[csilvers]

I had code like this:

def foo():
    ...
    self.assertEquals('some_arg=42', query)  # make sure query is preserved


@testsize.small
class ViewExerciseDeprecatedTest(web.testutil.webapp_testbase.Webapp2TestBase):
     ...


class GetRenderDataForPracticeTask(...):

I did slicker.py ViewExerciseDeprecatedTest <some other file>
and it moved the # make sure query is preserved comment along with the class!

It also ate too many blank lines, so the resulting file had only one line between foo() and GetRenderDataForPracticeTask().

To reproduce in webapp, check out d8e31c746e96fd and run
slicker.py content_render.exercise_handlers_test.ViewExerciseDeprecatedTest content_render/deprecated_handlers_test.py