Convert to GNU Configure & Build system

Conversion from homegrown Makefiles to full configure + Makefile.am,
so -- heads up packagers!  This will also make inadyn easier to port
to *BSD.

- configure script: --disable-ssl, --enable-openssl
  Default: SSL enabled using GnuTLS

- Makefile.am: all execept plugins/ have working automake Makefiles

- Add missing TODO, ChangeLog, AUTHORS, as per GNU conventions, with
  pointers to GitHub and details of project origin

Default to verbose build, use --enable-silent-rules to configure,
or V=0 when calling make to silence the built output.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
Minor cleanup of --help output.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
Minor update, mention --fake-address in SIGUSR1 descr.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
Travis CI: Update for GNU configure script build.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>