Added iSAC coder.

- Imported the floating point implementation of iSAC coder from stable public webRTC release:

http://code.google.com/p/webrtc/source/browse/#svn%2Fstable

- Added a reminder (in a TODO file) to switch from floating point to fixed point implementation.

Please note that this is the minimal amount of functionality we (the speech text-to-speech team) require
for delivering our unit selection algorithms for the Glass project. I'd be happy to address any comments
you have.

Change-Id: I20481680786ec5372258efcea69ea5c9750a321a
diff --git a/TODO b/TODO
new file mode 100644
index 0000000..a5f997a
--- /dev/null
+++ b/TODO
@@ -0,0 +1,3 @@
+Alexander Gutkin <agutkin@google.com>: Switch the iSAC codec to be
+   fixed rather than floating point. The current code uses floating
+   point implementation for purely experimental reasons.