Fix anchored regexes and ipv6 format on Windows

[gazpachoking]

Maybe should have made 2 pull requests. This branch fixes:

• pattern and patternProperties regexp matching to be unanchored
• ipv6 format checker to only be added when socket.inet_pton is available (ipv6 format checking on Windows #57)

[Julian]

Looks good, merge away.

Travis is broken because I forgot to tell load_tests to skip CSS if it
isn't present (so same issue here), but we'll fix that.

On Friday, February 8, 2013, Chase Sterling wrote:

Maybe should have made 2 pull requests. This branch fixes:

• pattern and patternProperties regexp matching to be unanchored
• ipv6 format checker to only be added when socket.inet_pton is
  available (ipv6 format checking on Windows #57 ipv6 format checking on Windows #57)

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You can merge this Pull Request by running

git pull https://github.com/gazpachoking/jsonschema fixes

Or view, comment on, or merge it at:

#58
Commit Summary

• Don't add ipv6 format checker if socket.inet_pton is not available
• Make sure pattern and patternProperties matches are not anchored

File Changes

• M jsonschema.pyhttps://github.com/Fix anchored regexes and ipv6 format on Windows #58/files#diff-0(41)

Patch Links:

• https://github.com/Julian/jsonschema/pull/58.patch
• https://github.com/Julian/jsonschema/pull/58.diff