drivers: added LPS331AP pressure sensor driver
board/iot-lab_M3: added interface for LPS331AP
tests: added test for LPS331AP sensor driver
Merge pull request #1817 from haukepetersen/add_driver_lps331ap

drivers: added driver for LPS331AP pressure sensor
lint: fix unassignedVariable warnings in stm32f1
lint: fix unusedVariable warnings
lint: fix redundantAssignment warnings
lint: fix unreadVariable warnings
lint: fix variableScope warnings
lint: fix invalidPrintfArgType_sint  warning
lint: fix uselessAssignmentPtrArg

    I've chosen to supress instead of removing the assignment because it looks
    like it may introduce a timing bias in the crypto code otherwise.
lint: fix warnings of possible nullPointer dereferences
lint: fix nullPointer errors
lint: fix syntaxError warning
cpu: stm32f1 spi: fix typos
lint: suppress warning about obsoleteFuntionsasctime
lint: suppress unusedStructMember in vendor files
lint: fix redundantCopy in udp code
SQUASH ME: into unreadVariable
SQUASH ME: redundantAssignment (remove FAT stuff)