Add alternatives key for listing other possible language matches

[Nixinova]

Contains files that are classified using the fallback language and lists what languages it could be.
Lists files and a list of matches under files.alternatives

• Resolves Add an unsure boolean key per file result #15

[Nixinova]

To determine: Should alternatives include the result?

"files": { "/x.pluginspec": "Ruby", }, "alternatives": { "/x.pluginspec": ["Ruby", "XML"], },

or

"files": { "/x.pluginspec": "Ruby", }, "alternatives": { "/x.pluginspec": ["XML"], },

?

[Nixinova]

Should alternatives include the result?

I'll go with no so that if (alternatives.length>0) {...} may be used