gpio_led: bugs fixed, PX4FMUv2 support added
sdlog2: getopt invalid usage fixed
sdlog2: use orb_check() instead of poll() to minimize polling overhead, bugs and compiler warnings fixed
sdlog2: code style fixed
Merge branch 'master' into sdlog2_opt
sdlog2: move some global variables to local scope, set default log rate to 50 Hz
sdlog2: lseek() workaround removed
sdlog2: bug fixed, sleep when idle too
sdlog2: max write chunk increased to 1024
Revert "sdlog2: max write chunk increased to 1024"

This reverts commit a478dac621301a993fb8ed13b86abd61d93bfec0.
dumpfile command and fetch_log.py tool implemented to fetch logs via nsh console on USB
Merge branch 'getopt_fixes' into sdlog2_opt
Merge branch 'master' into gpio_led_fmuv2
Merge branch 'master' into sdlog2_opt
Dropped default gains
Merge pull request #711 from PX4/sdlog2_opt

sdlog2 optimization
Merge pull request #712 from PX4/fetch_log

Log fetcher utility
Merge branch 'master' of github.com:PX4/Firmware into gpio_led_fmuv2
Merge pull request #728 from PX4/gpio_led_fmuv2

Gpio led fmuv2
Merge pull request #717 from PX4/iris_hotfix

Iris parameter hotfix: Dropped default gains