Added thread-safe tasks that will be run by the trema thread.
Added missing header files for Tasks feature.
Added options to disable various signal handlers in init_trema.
Merge branch 'edge' into feature-disable-sighandlers
Merge remote branch 'trema-edge/develop' into merge-disable-sighandlers
Merge remote branch 'trema-edge/develop' into merge-threadsafe-tasks
Fixed spelling error and variable name collision.
Readded current_tasks initialization.
Merge branch 'feature-threadsafe-tasks' into merge-threadsafe-tasks
Merge pull request #113 from axsh/merge-disable-sighandlers

Allow disabling of sighandlers
Merge pull request #114 from axsh/merge-threadsafe-tasks

Thread safe task passing to Trema
add debug messages
Merge branch 'develop' of github.com:trema/trema-edge into develop
Change variable arp_op to arp_opcode to avoid name collision with netinet/ether.h
Merge pull request #117 from rascov/develop

Change variable arp_op to arp_opcode to avoid name collision with netinet/ether.h
Restore the interface append_oxm_match_arp_op and add an exception in oxm-helper.c
Merge pull request #118 from rascov/develop

Keep using the interface append_oxm_match_arp_op() and add an exception in oxm-helper.c
add OFPG_ALL,OFPG_ANY as valid group_id
Merge pull request #119 from iHiroakiKawai/valid_group_id

add OFPG_ALL,OFPG_ANY as valid group_id