MC pos control offb: read altitude sp separately
turn on -Werror and fix resulting errors
VTOL: Remove unneeded headers
Unittests: add debug
rotate_3f() implement missing ROTATION_ROLL_270_YAW_270
Replace use of -Wno-error and only ignore specific warnings
Travis CI: Notify Gitter
README: Give developers a quickstart in finding dev docs
add interrupt latency printout command and mean/variance to interval performance counter
Merge pull request #1531 from kd0aij/interval_var

add interrupt latency printout and mean/variance to interval perf counter
Merge pull request #1465 from PX4/mcposoffbaltitude

MC pos control offb: read altitude sp separately
Integrate the Google Test framework.
Merge pull request #1534 from sjwilks/gtest

Integrate the Google Test framework.
Merge pull request #1527 from dagar/Werror

turn on -Werror and fix resulting errors
NuttX: Update version, addresses clock speed error message. Fixes #1510
Merge branch 'master' into bennodiscovery

Conflicts:
	uavcan