docs: remove @returns from @constructors, add @extends

Author: piersh

src/amplitude.js

@@ -13,7 +13,6 @@ define(function (require) {
    *  @constructor
    *  @param {Number} [smoothing] between 0.0 and .999 to smooth
    *                             amplitude readings (defaults to 0)
-   *  @return {Object}    Amplitude Object
    *  @example
    *  <div><code>
    *  var sound, amplitude, cnv;

src/audioin.js

@@ -24,7 +24,6 @@ define(function (require) {
    *                                    accessing the AudioIn. For example,
    *                                    Safari and iOS devices do not
    *                                    currently allow microphone access.
-   *  @return {Object} AudioIn
    *  @example
    *  <div><code>
    *  var mic;

src/compressor.js

@@ -18,8 +18,8 @@ define(function (require) {
    * https://www.w3.org/TR/webaudio/#the-dynamicscompressornode-interface
    *
    * @class p5.Compressor
+   * @extends p5.Effect
    * @constructor
-   * @return {Object} Returns a p5.Compressor object
    *
    * @example
    * <div><code>

src/delay.js

@@ -15,8 +15,8 @@ define(function (require) {
    *  original source.
    *
    *  @class p5.Delay
+   *  @extends p5.Effect
    *  @constructor
-   *  @return {Object} Returns a p5.Delay object
    *  @example
    *  <div><code>
    *  var noise, env, delay;

src/distortion.js

@@ -27,12 +27,12 @@ define(function (require) {
    * [Kevin Ennis](http://stackoverflow.com/questions/22312841/waveshaper-node-in-webaudio-how-to-emulate-distortion)
    *
    * @class p5.Distortion
+   * @extends p5.Effect
    * @constructor
    * @param {Number} [amount=0.25] Unbounded distortion amount.
    *                                Normal values range from 0-1.
    * @param {String} [oversample='none'] 'none', '2x', or '4x'.
    *
-   * @return {Object}   Distortion object
    */
   p5.Distortion = function(amount, oversample) {
     Effect.call(this);

src/effect.js

@@ -11,7 +11,6 @@ define(function (require) {
 	 *
 	 * @class  p5.Effect
 	 * @constructor
-	 * @return {Object} Returns a p5.Effect object
 	 * 
 	 */
 	p5.Effect = function() {

src/errorHandler.js

@@ -36,7 +36,7 @@ define(function () {
     });
     err.stack = splitStack.join('\n');
 
-    return err;
+    return err; // TODO: is this really a constructor?
   };
 
   return CustomError;

src/fft.js

@@ -39,7 +39,6 @@ define(function (require) {
    *  @param {Number} [bins]    Length of resulting array.
    *                            Must be a power of two between
    *                            16 and 1024. Defaults to 1024.
-   *  @return {Object}    FFT Object
    *  @example
    *  <div><code>
    *  function preload(){

src/filter.js

@@ -21,9 +21,9 @@ define(function (require) {
    *  bandpass, or resonance of the low/highpass cutoff frequency.
    *
    *  @class p5.Filter
+   *  @extends p5.Effect
    *  @constructor
    *  @param {String} [type] 'lowpass' (default), 'highpass', 'bandpass'
-   *  @return {Object} p5.Filter
    *  @example
    *  <div><code>
    *  var fft, noise, filter;

src/looper.js

@@ -390,7 +390,6 @@ define(function (require) {
    *  @class p5.Score
    *  @constructor
    *  @param {p5.Part} [...parts] One or multiple parts, to be played in sequence.
-   *  @return {p5.Score}
    */
   p5.Score = function() {
     // for all of the arguments