Rlease GCC ARM Embedded 4.7

Written for GNU Arm Embedded Toolchain by Joey Ye on 2012-12-24

The first 4.7 released is ready at https://launchpad.net/gcc-arm-embedded/+milestone/4.7-2012-q4-major

In addition to GCC 4.7 upgrading, this release also includes
* more code size optimizations
* newlib-nano: tailored libc based on newlib for code size (Beta)
* Mac OS host
* Debugger enhancement

Highly recommend to upgrade. 4.7 is backward compatible to 4.6 in command line. So it is almost risk-free for 4.6 users to embrace these new enhancement.

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