Fixed some warnings
Fixed some warnings

In mock build CalvinMini.cpp line 443 added (uint32_t) cast to the comparison
between length and hex array. In function handleSetupPorts line 287 change from
NULL to 0 in request obejct.

MalmoUniversity-DA366A/calvin-arduino,MalmoUniversity-DA366A/calvin-arduino,MalmoUniversity-DA366A/calvin-arduino