Add bodybuilder to list of query building libraries.

[danpaz]

Adding bodybuilder as yet another option of query builders. This one supports combining query clauses using boolean queries, e.g.

new Bodybuilder().query('match', 'title', 'quick')
                 .notQuery('match', 'title', 'lazy')
                 .orQuery('match', 'title', 'brown')
                 .orQuery('match', 'title', 'dog')
                 .build()

creates

{
  "query": {
     "bool": {
        "must":     [  { "match": { "title": "quick" }} ],
        "must_not": [  { "match": { "title": "lazy"  }} ],
        "should":   [
                        { "match": { "title": "brown" }},
                        { "match": { "title": "dog"   }}
                    ]
        }
    }
}

The library is under active development (e.g. need to support the new way of combining filters and queries in the 2.0 dsl) and my hope is to draw new contributors to the project by adding it to these docs.

I have signed the CLA.

[spalger]

Thanks @danpaz