Allow Query.select to accept a single string?

[jgeewax]

I figured if I wanted to select only one field, I could call .select('name') -- but got a scary error:

/usr/lib/node_modules/gcloud/lib/datastore/entity.js:520
  query.projection = q.selectVal.map(function(v) {
                                 ^
TypeError: undefined is not a function
    at Object.queryToQueryProto (/usr/lib/node_modules/gcloud/lib/datastore/entity.js:520:34)
    at Dataset.DatastoreRequest.runQuery (/usr/lib/node_modules/gcloud/lib/datastore/request.js:422:19)
    at Object.<anonymous> (/usr/local/google/home/jjg/datastore-playground.js:12:9)
    at Module._compile (module.js:460:26)
    at Object.Module._extensions..js (module.js:478:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Function.Module.runMain (module.js:501:10)
    at startup (node.js:129:16)
    at node.js:814:3

Could we make the following snippet run happily?

// Note not an array being passed in!
var query = dataset.createQuery('MyKind').select('name');
dataset.runQuery(query);

// AND still:

var query = dataset.createQuery('MyKind').select(['name']);
dataset.runQuery(query);