Incomplete add of KL25Z; Fix some reserved symbol variable names
Merge branch 'master' of https://github.com/mbedmicro/mbed

Conflicts:
	workspace_tools/build.py
	workspace_tools/build_api.py
	workspace_tools/make.py
	workspace_tools/targets.py
	workspace_tools/tests.py
	workspace_tools/toolchains/__init__.py
	workspace_tools/toolchains/arm.py
	workspace_tools/toolchains/gcc.py