(feature) Add _.lowerCase and _.lowerFirst

lodash/lodash-tests.ts

@@ -8289,6 +8289,38 @@ module TestKebabCase {
     }
 }
 
+// _.lowerCase
+module TestLowerCase {
+    {
+        let result: string;
+
+        result = _.lowerCase('Foo Bar');
+        result = _('Foo Bar').lowerCase();
+    }
+
+    {
+        let result: _.LoDashExplicitWrapper<string>;
+
+        result = _('Foo Bar').chain().lowerCase();
+    }
+}
+
+// _.lowerFirst
+module TestLowerFirst {
+    {
+        let result: string;
+
+        result = _.lowerFirst('Foo Bar');
+        result = _('Foo Bar').lowerFirst();
+    }
+
+    {
+        let result: _.LoDashExplicitWrapper<string>;
+
+        result = _('Foo Bar').chain().lowerFirst();
+    }
+}
+
 // _.pad
 module TestPad {
     {

lodash/lodash.d.ts

@@ -13078,6 +13078,79 @@ declare module _ {
         kebabCase(): LoDashExplicitWrapper<string>;
     }
 
+    //_.lowerCase
+    interface LoDashStatic {
+        /**
+         * Converts `string`, as space separated words, to lower case.
+         *
+         * @static
+         * @memberOf _
+         * @category String
+         * @param {string} [string=''] The string to convert.
+         * @returns {string} Returns the lower cased string.
+         * @example
+         *
+         * _.lowerCase('--Foo-Bar');
+         * // => 'foo bar'
+         *
+         * _.lowerCase('fooBar');
+         * // => 'foo bar'
+         *
+         * _.lowerCase('__FOO_BAR__');
+         * // => 'foo bar'
+         */
+        lowerCase(string?: string): string;
+    }
+
+    interface LoDashImplicitWrapper<T> {
+        /**
+         * @see _.lowerCase
+         */
+        lowerCase(): string;
+    }
+
+    interface LoDashExplicitWrapper<T> {
+        /**
+         * @see _.lowerCase
+         */
+        lowerCase(): LoDashExplicitWrapper<string>;
+    }
+
+    //_.lowerFirst
+    interface LoDashStatic {
+        /**
+         * Converts the first character of `string` to lower case.
+         *
+         * @static
+         * @memberOf _
+         * @category String
+         * @param {string} [string=''] The string to convert.
+         * @returns {string} Returns the converted string.
+         * @example
+         *
+         * _.lowerFirst('Fred');
+         * // => 'fred'
+         *
+         * _.lowerFirst('FRED');
+         * // => 'fRED'
+         */
+        lowerFirst(string?: string): string;
+    }
+
+    interface LoDashImplicitWrapper<T> {
+        /**
+         * @see _.lowerFirst
+         */
+        lowerFirst(): string;
+    }
+
+    interface LoDashExplicitWrapper<T> {
+        /**
+         * @see _.lowerFirst
+         */
+        lowerFirst(): LoDashExplicitWrapper<string>;
+    }
+
     //_.pad
     interface LoDashStatic {
         /**