Merge branch 'release/1.2.0' into develop
Add signal.h as reported by gnehzuil
evthr_*set_backlog for SO_RCVBUF sockopts
SO_RCVBUF should be multiple of sizeof(evthr_cmd_t)
Fix missing symbol SIGTERM by including signal.h
Examples will only built if "make examples" is run.
Merge commit 'c449ad8fe77d60393ca6f5b3b67957f2c1fc37d4' into develop
Fixed enum typedef issue reported by scott--
Use system onig if avail, install includes in include/evthr

- If onig is already installed on the system, the local version will not be
  used.

- evhtp specific headers are now installed into include/evhtp/
Added evhtp_request_status() to get client response code.
Fix typo in cmakelist