core/cpu/boards: removed fw_puts from RIOT
Merge pull request #2048 from haukepetersen/rem_ioarch

core/cpu/boards: removed fw_puts from RIOT
cpu: rename arm_common to arm7_common

To be more accurate with the naming and avoid confusions.
cpu: arm7_common: added extern C guards
Merge pull request #2062 from OlegHahm/arm7_common_rename

cpu: rename arm_common to arm7_common