Added missing memb_free in queuebuf.c
Fix deallocation in queuebuf.c, case where QUEUEBUF_STATS is set
Remove unnecessary list_remove in ctimer.c (list_add automatically removes first)
struct queuebuf_data: swap len with data to make sure data is 32-bit aligned
struct frame802154_t: make sure dest_addr and src_addr are aligned
frame802154: move inclusion of linkaddr.h from .h to .c file
Merge pull request #857 from simonduq/fix-queuebuf

Added missing memb_free in queuebuf.c
Merge pull request #861 from simonduq/queuebuf-field-order

Alignment of field `data` in queuebuf
Merge pull request #860 from simonduq/frame802154-align

frame802154_t: make sure dest_addr and src_addr are aligned
Merge pull request #858 from simonduq/cleanup-ctimer

Remove unnecessary list_remove in ctimer.c (list_add automatically remov...
Fix doxygen prerequisites
Sort docdirs

Sorting docdirs is requierd to get reproducable results
Add doxygen regression testing
Add doxygen regression test to travis
Adjust number of errors to travis environment