Add a manual page for the riemann-client tool

The manual page is written in Ronn, so that becomes an optional
dependency.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
riemann-client: Exit successfully when ran w/o arguments

Running without arguments is ok, that's how we display the help.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
riemann-client: Allow --help|-? without any command too

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
riemann-client: Add --ttl|-L to the help output

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
Makefile.am: The manual page depends on NEWS too

Since we extract the date from the NEWS file, add a dependency on it
too. And in order not to embed the NEWS file into the manual page, use
$< instead of $^.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
Release riemann-c-client 1.0.2

NEWS & configure.ac updated.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>