Minor fix/enhancement to BUILD.md.

1) Point CMake to www.cmake.org insead of www.python.org.

2) Give a couple of helpful pointers for ICD developers.
diff --git a/BUILD.md b/BUILD.md
index 2214fb0..bef5b6d 100644
--- a/BUILD.md
+++ b/BUILD.md
@@ -3,6 +3,8 @@
 Support for Windows is for the loader and layers (additional info below).  Additional Windows support will be coming in Q1'15.
 Support for Android is TBD.
 
+Note: If you are doing ICD (driver) development, please make sure to look at documentation in the [*ICD Loader*](loader/README.md) and the [*Sample Driver*](icd).
+
 ##Linux System Requirements
 Ubuntu 14.10 needed for DRI 3
 
@@ -110,7 +112,7 @@
 Windows 7+ with additional, software:
 
 - Microsoft Visual Studio 2013 Professional.  Note: it is possible that lesser/older versions may work, but that has not been tested.
-- CMake (from https://www.python.org/downloads).  Note: Configure to add itself to the system PATH environment variable.
+- CMake (from http://www.cmake.org/cmake/resources/software.html).  Note: Configure to add itself to the system PATH environment variable.
 - Python 3 (from https://www.python.org/downloads).  Note: Configure to add itself to the system PATH environment variable.
 - Cygwin (especially a BASH shell and git packages--from https://www.cygwin.com/).