NUCLEO_F103RB: Add I2C master api
Merge branch 'master' of https://github.com/mbedmicro/mbed
[NUCLEO_F103RB] Align startup files with other targets
Merge branch 'master' of https://github.com/mbedmicro/mbed
[NUCLEO_F103RB] Code cleanup
[NUCLEO_F103RB] Add more generic signal names for the examples.
[NUCLEO_F103RB] Code cleanup
Merge pull request #123 from bcostm/master

[NUCLEO_F103RB] Add I2C master, code cleanup, ...