Begins nrf51822 gcc arm export
First pass at linker script
Makes sure the extension is .bin when using GCC_ARM
Begin export
Oops
Add nrf51822 to export target
Updates NRF51822 target defines
Adds basic tmpl file
Adds check for INITIAL_SP
Adds startup file
Merges linker scripts into a single file
Puts the NRF51822 test in a nicer place
Enables hex hook
Exporter outputs hex
Adds sreg concat
Updates clock value
cleanup
Merge branch 'nrf51822-gcc-arm-export' of git://github.com/juancferrer/mbed into juancferrer-nrf51822-gcc-arm-export

Conflicts:
	workspace_tools/export/gccarm.py
	workspace_tools/export_test.py
	workspace_tools/targets.py
Merge branch 'juancferrer-nrf51822-gcc-arm-export'