lint: supress warnings about nan/infty in arithmetics in the CBOR unit tests

Travis: merge install commands

Travis: enable apt caching

tests: enable cppcheck for PR in travis

Failures are ignored for now.

This should speed up the installation process a bit.

lint: limit maximum length of input via scanf

iot-lab_M3: fix numof uart

dist/pyterm: control server incl. support for multiple testbeds

cpu/boards: completed GPIO driver for sam3x8e

sys: use typedef for `struct bloom_t`

cpu/nrf51822: adjusted default stack sizes

board/yunjia-nrf51822: adjusted openocd.cfg

doc: add license headers to some .h files

- adjusted peripheral conf for udoo and arduino-due
- added gpio_init_int()
- added interrupt service routines
- fixed gpio_read()
- added clock enable for gpio_init_in()

Add board yunjia

`bloom_t` is defined as a struct.
`_t` can mislead the user to think of bloom_t
as a typedef (see our coding conventions) instead of a struct.
Thus, I modified `struct bloom_t` to be a *typedefed* struct.

Another solution would be to rename bloom_t to sth. like bloom_s
everywhere and use `struct bloom_s` instead of `bloom_t`.

drivers: fixed German influenced typo

- enabled power for uart and timer
- outsourced timer config values to periph_conf.h
- made linkerscript better readable
- adjusted default stack-sizes
- let RED_LED blink on hard_fault

lint: fix warnings because of uninitialized variables

doc: tailor CMSIS doxygen for license checker

drivers/at86rf231: handle channel out of range more conveniently

boards/iot-lab_M3: fixing term make target