newt - 1-dev and 1.0-dev should not compare equal
newt - 1-dev and 1.0-dev should not compare equal

Newt generated some false positives when comparing the desired repo
version against an actual version.  The problem was that unspecified
version parts were set to 0.  Thus, the following two versions would
compare equal to one another:

    o 1-latest
    o 1.0-latest

The fix is to set unspecified version parts to a special value (-1).

apache/incubator-mynewt-newt,apache/incubator-mynewt-newt