Enable gitlab CI

Even though the overviewer repo is hosted on github, this new CI stuff
is useful for mirrors of overviewer hosted on gitlab.

To support package builds for a few distributions, a set of dockerfiles
have been created.

build-tools/dockerfiles/centos5/Minecraft-Overviewer.spec

@@ -0,0 +1,39 @@
+%define python_sitearch %{_libdir}/python2.6/site-packages
+
+Summary: Generates large resolution images of a Minecraft map.
+Name: Minecraft-Overviewer
+Version: {VERSION}
+Release: 1%{?dist}
+Source0: %{name}-%{version}.tar.gz
+License: GNU General Public License v3
+Group: Development/Libraries
+BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-buildroot
+Vendor: Andrew Brown <brownan@gmail.com>
+Url: http://overviewer.org/
+Requires: python26, python26-imaging, python26-numpy
+BuildRequires: python26-devel, python26-imaging-devel, python26-numpy, python-setuptools
+
+%description
+The Minecraft Overviewer is a command-line tool for rendering high-resolution
+maps of Minecraft worlds. It generates a set of static html and image files and
+uses the Google Maps API to display a nice interactive map.
+
+%prep
+%setup -n %{name}
+
+%build
+env CFLAGS="$RPM_OPT_FLAGS" %{__python}26 setup.py build
+
+%install
+%{__python}26 setup.py install -O1 --root=%{buildroot}
+rm -rf %{buildroot}%{_defaultdocdir}/minecraft-overviewer
+
+%clean
+rm -rf %{buildroot}
+
+%files
+%defattr(-,root,root)
+%{python_sitearch}/Minecraft_Overviewer-*-*.egg-info
+%{python_sitearch}/overviewer_core
+%{_bindir}/overviewer.py
+%doc README.rst COPYING.txt sample_config.py