Doc: Add CONTRIBUTING.md file

Signed-off-by: Eduardo Silva <edsiper@gmail.com>
Libmonkey: fix build and add test for mimetype
Doc: update CONTRIBUTING with 'Commit Changes' info

Signed-off-by: Eduardo Silva <edsiper@gmail.com>
Removing conditionals in src/mk_http.c
Merge branch 'master' of https://github.com/tssavita/monkey