Added pin names for SPI buses and SPI chip select lines as well as pin names for GPIO pins.
Fixed RTOS compilation for some targets

More details: https://github.com/mbedmicro/mbed/pull/472
Revert "Fixed crash issue in RawSerial::printf for uARM"

This reverts commit d05b7f51d8db8b8081e1768b69802d992c20040c.

I am reverting this commit because:

- it uses alloca(), which is a dangerous function
- it uses vsprintf instead of vsnprintf, which can lead to a stack overflow.

Until we find a better solution, this might do more bad than good, so I am reverting it.
Fixed syntax error in build_release.py
Fixed RTOS compilation for some targets (in exporters)

More details: https://github.com/mbedmicro/mbed/pull/472
Merge branch 'master' of github.com:mbedmicro/mbed
OTA target support for nRF51822 and nRF51-DK
Bumped revision number
Merge remote-tracking branch 'upstream/master'
Merge pull request #490 from AFritzMulti/master

[HAL] MTS_GAMBIT - SPI pin names expansion
Removed Semihost tests from FRDM devices - to check why they fail
Modified host tests to use serial.realine() function to avoid extra timeouts during tests (test will work faster and will be more reliable)
Modified host tests to use serial.realine() function to avoid extra timeouts during tests (test will work faster and will be more reliable)
Modified host tests to use serial.realine() function to avoid extra timeouts during tests (test will work faster and will be more reliable)