Fix issue #6: Convert to fully make use of the GNU Configure and Build system

Initial conversion from lightweight configure with homegrown Makefile.in
to using full configure + Makefile.am -- heads up, files may be missing
from `make dist` or `make install`!

This commit should also fix the last issues with install/unzip mentioned
in issue #5 -- resulting README and ChangeLog are now copied to archive.

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