Support removal of multiple value same key URLs

[jstarcher]

Is it possible to use the .remove() method with multiple value keys?

# Actual
>>> furl('/foo/?gender=M&gender=F&location=CA').remove({'gender': 'M'}).url
'/foo/?location=CA'

# Expected
>>> furl('/foo/?gender=M&gender=F&location=CA').remove({'gender': 'M'}).url
'/foo/?gender=F&location=CA'

# Workaround
>>> f = furl('/foo/?gender=M&gender=F&location=CA')
>>> f.args.popvalue('gender', 'M')
>>> print f.url
'/foo/?gender=F&location=CA'

[gruns]

This would be useful, albeit infrequently used.

Removing multiple keys will also be supported when provided a dictionary with
list values or any 'dictionary-like' iterable.

>>> furl('/foo/?gender=M&gender=F&gender=robot')
      .remove([('gender','M'),('gender','F')]).url
'/foo/?gender=robot'

>>> furl('/foo/?gender=M&gender=F&gender=robot')
      .remove({'gender': 'M'}).url
'/foo/?gender=M&gender=robot'

I'll add such functionality shortly.

[gruns]

furl v0.3.7's Query.remove() supports the removal of multiple values from the
same key through a list of items, a dictionary, or a multivalue dictionary.

>>> furl('/foo/?gender=M&gender=F&location=CA').remove({'gender': 'M'}).url
'/foo/?gender=F&location=CA'

>>> furl('/foo/?gender=M&gender=F&location=CA').remove([('gender', 'M')]).url
'/foo/?gender=F&location=CA'

>>> from orderedmultidict import omdict
>>> omd = omdict([('gender', 'M'), ('location', 'CA')])
>>> furl('/foo/?gender=M&gender=F&location=CA').remove(omd).url
'/foo/?gender=F'

Upgrade to furl v0.3.7 with

pip install furl --upgrade

Thank you for bringing this issue to my attention jstarcher.

[jstarcher]

Great work, thanks @gruns!