Use Weather Underground astronomy data for sun rise/set

Changes discussed in issue #3

package.json

@@ -12,7 +12,6 @@
     "express": "^4.13.0",
     "grunt": "^0.4.5",
     "mongoose": "^4.0.6",
-    "suncalc": "^1.6.0",
     "xml2js": "^0.4.9"
   },
   "devDependencies": {

routes/weather.js

@@ -1,5 +1,4 @@
 var http		= require( "http" ),
-	SunCalc		= require( "suncalc" ),
 	parseXML	= require( "xml2js" ).parseString,
 	Cache		= require( "../models/Cache" ),
 
@@ -41,30 +40,20 @@ function resolveCoordinates( location, callback ) {
 // Retrieve weather data to complete the weather request using Weather Underground
 function getWeatherUndergroundData( location, weatherUndergroundKey, callback ) {
 
-	// Generate URL using The Weather Company API v1 in Imperial units
+	// Generate URL using Weather Underground yesterday conditions
 	var url = "http://api.wunderground.com/api/" + weatherUndergroundKey +
-		"/yesterday/conditions/q/" + encodeURIComponent( location ) + ".json";
+		"/yesterday/conditions/astronomy/q/" + encodeURIComponent( location ) + ".json";
 
 	// Perform the HTTP request to retrieve the weather data
 	httpRequest( url, function( data ) {
 		try {
 			data = JSON.parse( data );
 
-			var tzOffset = getTimezone( data.current_observation.local_tz_offset, "minutes" ),
-
-				// Calculate sunrise and sunset since Weather Underground does not provide it
-				sunData = SunCalc.getTimes( data.current_observation.local_epoch * 1000,
-											data.current_observation.observation_location.latitude || data.current_observation.display_location.latitude,
-											data.current_observation.observation_location.longitude || data.current_observation.display_location.longitude );
-
-			sunData.sunrise.setUTCMinutes( sunData.sunrise.getUTCMinutes() + tzOffset );
-			sunData.sunset.setUTCMinutes( sunData.sunset.getUTCMinutes() + tzOffset );
-
 			var weather = {
 				icon:		data.current_observation.icon,
 				timezone:	data.current_observation.local_tz_offset,
-					sunrise:	( sunData.sunrise.getUTCHours() * 60 + sunData.sunrise.getUTCMinutes() ),
+				sunrise:	parseInt( data.sun_phase.sunrise.hour ) * 60 + parseInt( data.sun_phase.sunrise.minute ),
-					sunset:		( sunData.sunset.getUTCHours() * 60 + sunData.sunset.getUTCMinutes() ),
+				sunset:		parseInt( data.sun_phase.sunset.hour ) * 60 + parseInt( data.sun_phase.sunset.minute ),
 				maxTemp:	parseInt( data.history.dailysummary[0].maxtempi ),
 				minTemp:	parseInt( data.history.dailysummary[0].mintempi ),
 				temp:		parseInt( data.current_observation.temp_f ),

test/replies.json

@@ -20,7 +20,8 @@
 	            "termsofService": "http://www.wunderground.com/weather/api/d/terms.html",
 	            "features": {
 	                "yesterday": 1,
-	                "conditions": 1
+	                "conditions": 1,
+	                "astronomy": 1
 	            }
 	        },
 	        "current_observation": {
@@ -107,6 +108,34 @@
 	            "ob_url": "http://www.wunderground.com/cgi-bin/findweather/getForecast?query=42.408440,-72.504799",
 	            "nowcast": ""
 	        },
+			"moon_phase": {
+				"percentIlluminated": "48",
+			     "ageOfMoon": "7",
+			     "phaseofMoon": "Waxing Crescent",
+			     "hemisphere": "North",
+			     "current_time": {
+			     	"hour": "18",
+			     	"minute": "08"
+			     },
+			     "sunrise": {
+			     	"hour": "6",
+			     	"minute": "27"
+			     },
+			     "sunset": {
+			     	"hour": "20",
+			     	"minute": "23"
+			     }
+			},
+			"sun_phase": {
+				"sunrise": {
+					"hour": "5",
+					"minute": "24"
+				},
+			    "sunset": {
+			    	"hour": "20",
+			    	"minute": "28"
+			    }
+			},
 	        "history": {
 	            "date": {
 	                "pretty": "July 11, 2015",