test size, vertical and horizontal precision values in LOC records
Fix default size, horizontal and vertical precition values for LOC records.

Default values in RFC 1876 are in meters but the old code used
the numerical value as centimeters.
Fix vertical precision parsing for LOC records.

Vertical precision value was ignored if the optional 'm' (unit)
was missing at the end of input and rest of the input was ignored.
Skip DNSSEC ECDSA tests if there is no python ecdsa package.
Merge pull request #49 from spacekpe/skip-ecdsa-tests

Skip DNSSEC ECDSA tests if there is no python ecdsa package.
Merge pull request #48 from spacekpe/loc-fix

Fix issue #47 - LOC record parsing
Use standard inet_aton and inet_ntoa methods provided by Python.

This change ensures that dns.resolver will not fail during
/etc/resolv.conf parsing.

E.g. leading zeros (127.0.0.01) are happily accepted by
glibc but python-dns fails on that.