internals: "fast detection" for collection iteration doesn't work for non-stable versions

[briantist]

galactory/galactory/utilities.py

Line 94 in d1af360

f_namespace, f_name, f_version = p.name.replace('.tar.gz', '').split('-')

Pretty minor, but the fast detection will never work for a version that contains a hyphen like 1.2.3-alpha because the split will have more than 3 results.

This should be fixable by setting the second argument of split to 3.

This "failure" really just means falling back to "slow" detection that requires some additional requests.