Ignore any unused entry that starts with '_'.

This makes it possible to follow PEP8 which recommends '__',
and to name unused entries, e.g.:

    foo, _bar, _zed = func()
don't include buildtime in watermark
Merge pull request #310 from moben/master

don't include buildtime in watermark
minor cleanup
changelog
prepare release of Cython 0.21 beta 2
changelog
changelog
safety fix in test to get more reproducible results
test runner: include cythonize.py script in 2to3 conversion
comment
extend test to cover from-import list with trailing comma
add missing tp_new() call test (found by coverage analysis)
speed up appending integer values to bytearray objects in Py3
ignore gc.collect() result in test
add missing utility code dependency
refactor duplicated code in utility function
move JediTyper into Tools directory as it's not in a state that would suggest making it a part of Cython

--HG--
rename : Cython/Compiler/Tests/TestJediTyper.py => Cython/Tests/TestJediTyper.py
rename : Cython/Compiler/JediTyper.py => Tools/jedi-typer.py
optimise method calls in backport of matix multiplication
fix error handling in backported matrix multiplication and compare to actual behaviour in Py3.5