Supporting gcc 4.8.x

Release 3.1.1 is a minor update to 3.1.0 that adds support for gcc 4.8.x. Some new warnings were introduced in the new gcc and since I always compile with warnings as errors I had to go in and correct the source of the warnings.

The officially supported toolchain is now gcc version 4.8.1 (Sourcery CodeBench Lite 2013.11-24). Please visit the CodeSourcery (aka Mentor Graphics) website to download the toolchain.