lodash: added _.floor() method

lodash/lodash-tests.ts

@@ -520,6 +520,20 @@ result = <number>_(6.004).ceil(2);
 result = <number>_(6040).ceil(-2);
 // → 6100
 
+// _.floor
+result = <number>_.floor(4.006);
+// → 4
+result = <number>_.floor(0.046, 2);
+// → 0.04
+result = <number>_.floor(4060, -2);
+// → 4000
+result = <number>_(4.006).floor();
+// → 4
+result = <number>_(0.046).floor(2);
+// → 0.04
+result = <number>_(4060).floor(-2);
+// → 4000
+
 result = <number>_.max([4, 2, 8, 6]);
 result = <IStoogesAge>_.max(stoogesAges, function (stooge) { return stooge.age; });
 result = <IStoogesAge>_.max(stoogesAges, 'age');

lodash/lodash.d.ts

@@ -3572,6 +3572,24 @@ declare module _ {
         ceil(precision?: number): number;
     }
 
+    //_.floor
+    interface LoDashStatic {
+        /**
+         * Calculates n rounded down to precision.
+         * @param n The number to round down.
+         * @param precision The precision to round down to.
+         * @return Returns the rounded down number.
+         */
+        floor(n: number, precision?: number): number;
+    }
+
+    interface LoDashWrapper<T> {
+        /**
+         * @see _.floor
+         */
+        floor(precision?: number): number;
+    }
+
     //_.max
     interface LoDashStatic {
         /**