* Improvement of the build system

make install now installs the headers

Signed-off-by: Vinzenz Feenstra <vinzenz.feenstra@gmail.com>
* Version bump 0.3.12

Signed-off-by: Vinzenz Feenstra <vinzenz.feenstra@gmail.com>
* Building

- Compilation warning for variant.hpp removed
- Attempt to obey FHS in configure.ac started
- Building now also the example (but not installing it)

Signed-off-by: Vinzenz Feenstra <vinzenz.feenstra@gmail.com>
Updated changelog for 0.3.12

Signed-off-by: Vinzenz Feenstra <vinzenz.feenstra@gmail.com>