Disallow leading zeros in semver version strings.
Disallow empty prerelease identifiers and ones with leading zeros.
Disallow empty identifiers in build metadata.
Check numeric prerelease identifiers precede non-numeric ones.
Test leading zeros not allowed in opscode semver.
Docs reflect update to semver 2.0.0.
Bump patch version to reflect update to semver 2.0.0.
Revert "Bump patch version to reflect update to semver 2.0.0."

This reverts commit c5b6aa26c7bde216ea95a367a09c327a27776dd0.
Examples with multiple leading zeros.
Merge pull request #4 from opscode/clean-update-to-semver-2.0.0

Clean update to semver 2.0.0