Replace version compare with NIH lib

[jsocol]

Would semanticversion work for our version comparison needs? Then we could stop maintaining the version comparison module here. Firefox versions may be too idiosyncratic, though.

cc @lauraxt, because I know socorro is one of the biggest consumers of the version compare library.

[fwenzel]

Input is another consumer of this library.

Generally, I have no objections to using a library that already exists and might be maintained better than this, for sure.

Does it pass these tests: https://github.com/fwenzel/django-mozilla-product-details/blob/master/product_details/version_compare/tests.py ?

Also, not sure if anyone uses the numeric representation of versions in order to push version ordering into the database; Socorro might.

[jsocol]

@lauraxt, anyone on your team have an opinion about this?