[NUCLEO_F401RE] add I2C master asynch#1791

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dbestm wants to merge 3 commits intoARMmbed:masterfrom

dbestm:dev_nucleo_f401re_i2c_asynch_2

Commits on May 26, 2016

[NUCLEO_F401RE] add I2C master asynch
dbestm
committed

Commits on May 27, 2016

[NUCLEO_F401RE] I2C master asynch
dbestm
committed

Commits on Jun 6, 2016

[NUCLEO_F401RE] clean up misalignment in i2c_api.c
dbestm
committed