Remove sensor parameter

Closes jpowers#12. This parameter is no longer required for [Search](https://developers.google.com/places/documentation/search), [Autocomplete](https://developers.google.com/places/documentation/autocomplete), or [Detail](https://developers.google.com/places/documentation/detail)

lib/google-places.js

@@ -31,7 +31,6 @@ GooglePlaces.prototype.search = function(options, cb) {
   options = _.defaults(options, {
     location: [42.3577990, -71.0536364],
     radius: 10,
-    sensor: false,
     language: 'en',
     rankby: 'prominence',
     types: []
@@ -53,7 +52,6 @@ GooglePlaces.prototype.search = function(options, cb) {
 GooglePlaces.prototype.autocomplete = function(options, cb) {
   options = _.defaults(options, {
     language: "en",
-    sensor: false
   });
 
   this._doRequest(this._generateUrl(options, 'autocomplete'), cb);
@@ -63,7 +61,6 @@ GooglePlaces.prototype.autocomplete = function(options, cb) {
 GooglePlaces.prototype.details = function(options, cb) {
   options = _.defaults(options, {
     reference: options.reference,
-    sensor: false,
     language: 'en'
   });