Ignore various build and temporary files
Ignore various build and temporary files

Ignore:
- .cooja
- .swp (vim editor temporary files)
- doc/latex/
- various build & temporary files generated in regression-tests

MohamedSeliem/contiki,MohamedSeliem/contiki,arurke/contiki,MohamedSeliem/contiki,arurke/contiki,MohamedSeliem/contiki,arurke/contiki,arurke/contiki,arurke/contiki,MohamedSeliem/contiki,arurke/contiki,arurke/contiki,MohamedSeliem/contiki,MohamedSeliem/contiki