[NUCLEO_F401RE] Add LSE configuration for RTC, remove trailing spaces, typo corrections
[NUCLEO_F401RE] Add missing files for LSE configuration, typo
[NUCLEO_F030R8] add I2C slave, enhance clock settings
[NUCLEO_F030R8] modif in device.h to enable I2C slave and SPI slave
Merge branch 'master' of git://github.com/dbestm/mbed into dbestm-master