Squashed commit of the following:

Squashed commit of the following:

commit b80e690164b152a2fc8ae55c549cf6082c29719a
Author: Andy Hung <hunga@google.com>
Date:   Thu May 22 18:26:07 2014 -0700

    Add sf_readf_int to read files as 32 bit PCM int

    Change-Id: Ic98cca69926309b1a8f77cc702bc54aba20e3996

commit a0d0fb2d89f5b22cf82dc5a4da52e4bbc3aaffb6
Author: Andy Hung <hunga@google.com>
Date:   Thu May 22 18:17:53 2014 -0700

    Update sf_readf_float to handle 16 and 32 bit PCM

    Change-Id: I0f74ca686f1a86e724057bc483924cea13577ef0

Change-Id: Ie18b611b3025e9b0c566c024b774f2cb2c49ceda