customizable results - supporting more operators/separators

[seiyria]

right now, the library supports - for ranges and , for arrays, but would be nice is the ability to support other separators and the keys they get put into. I would like to add support for + into an ands property, where it would not mix with other operators.

so:

• id:x+y would result in { ands: { id: ['x', 'y'] } }
• id:x id:y+z would result in { id: ['x'], ands: { id: ['y', 'z'] } }

alternatively, just having support for ands would be nice too.