Update release information files. * Combined AUTHORS and CONTRIBUTORS. * Added some more folks to the AUTHORS file based on commit history. * Added Makefile recipe to dynamically generate ChangeLog from last annotated tag or a specified ref. * Added ignores for tarballs and ChangeLog.

Makefile
Makefile.in
lm-change-password
lm-register
lm-send-async
lm-send-sync
test-http-proxy
test-lm
test-tunnel
*.swp