added weeks as shortcut for Int extensions

ExSwift/Int.swift

@@ -220,6 +220,14 @@ public extension Int {
     var year: NSTimeInterval {
         return self.years
     }
+
+    var week: NSTimeInterval {
+        return 7 * self.days
+    }
+
+    var weeks: NSTimeInterval {
+        return self.week
+    }
 
     var days: NSTimeInterval {
         return 24 * self.hours

ExSwiftTests/IntExtensionsTests.swift

@@ -198,6 +198,19 @@ class IntExtensionsSpec: QuickSpec {
 
             }
 
+            it("weeks") {
+                expect(0.weeks) == 0
+                expect(1.week) == 604800
+                expect(111.weeks) == 604800 * 111
+
+                expect(-1.week) == -604800
+                expect(-111.weeks) == -604800 * 111
+
+                expect(0.year) == 0.years
+                expect(1.year) == 1.years
+                expect(1010.year) == 1010.years
+            }
+
             it("days") {
 
                 expect(0.days) == 0