Update readme.md

Adding instructions to install commandline tools on Mac OS Lion+
Upgrade to the latest mentor toolchain.
Merge pull request #1 from pebble/upgrade-to-mentor-nov-2012

Upgrade to the latest mentor toolchain.
Add symbols, remove floating point IO support
Build GCC statically (remove dependency to libmpc, etc)

 - Build libmpc, libmpfr and libgmp in build/libs
   The trick here is that we build them with --disable-shared
 - Compile gcc and use those libs. Because the shared are not available
   it will automatically compile statically

That's it! Was pretty easy ;)
Removed one extra line of --with-gmp-and-friend
Add incremental build support
Add incremental tar extraction
Add incremental configuration
Remove cross-newlib as a install-tools dep

cross-newlib is a cross-gcc dep so it will still be run. Pulling
cross-newlib up to a install-tools dep causes gross-gcc to recompile.
Add --enable-static configure flag for mpfr and mpc
Set install-deps as phony
Ignore libs directory
Add -Wno-error=return-type CFLAG for building gdb with clang
Merge remote-tracking branch 'jsnyder/master' into import-upstream-toolchain-changes

Conflicts:
	Makefile
Disable makeinfo command for broken info files
Merge pull request #4 from pebble/import-upstream-toolchain-changes

Import upstream toolchain changes
Merge pull request #34 from pebble/master

Merge work back upstream