Style: Fixed appendWithPunct (mappend for Formatted).

One definition was wrong, causing commas to be lost in certain places.
Closes #57.
test-pandoc-citeproc:  don't hard code test files.

Instead, read from directory.  THat way we can add new tests
without recompiling the test suite.
ADded test for issue #57.
Added chicago-author-date-with-original-date-and-status.csl.

Needed for #57 test.
Moved chicago-author-date-with-original-date-and-status to tests.
Moved science.csl needed for issue27 test into tests.
Fixed issue27 expected output.

It is actually correct for the science style to say "in press"
when the page range is non-numerical.