Delay parsing the mappings until queried for a source location
Merge pull request #81 from fitzgen/delay-parsing

Delay parsing the mappings until queried for a source location
allow 'names' to be undefined, default to an empty array
allow 'version' to be a string
Merge pull request #85 from harthur/optional-names

allow 'names' to be undefined, default to an empty array to play nice with Sass
Merge pull request #86 from harthur/string-version

allow 'version' to be a string to play nice with Sass
Explain a little more about not strictly adhering to the spec in
SourceMapConsumer due to Sass generating source maps that don't quite match the
spec.
Bump version to 0.1.31