Add a configure script

Adapted from pip-db, see https://github.com/ChrisCummins/pip-db/.

Issue #69.
Remove www/Makefile

Issue #69.
Remove www/*/.gitignore files

Issue #69.
Rename 'www/*.in' to 'www/*'

Issue #69.
Move www/COPYING to COPYING
configure: Enable www/index.php check

Issue #69.
Add an autogen.sh script

Copied from pip-db, see: https://github.com/ChrisCummins/pip-db/.

Issue #69.
git: Ignore autotools by-products

Issue #69.
git: Don't ignore dotfiles
git: Ignore patches and VCS by-products
configure: Fix config.sumary top line

Issue #69.
configure: Remove pip-db Makefile list

Issue #69.
git: Ignore config.summary

Issue #69.
Import pip-db .htaccess file

See: https://github.com/ChrisCummins/pip-db/.

Issue #69.
Add skeleton build files

Imported from pip-db. See: https://github.com/ChrisCummins/pip-db/.

Issue #69.
Add css and js directory Makefiles

Issue #69.
configure.ac: Strip unused variables from summary

Issue #69.
build/www: Recurse into css and js directories

Issue #69.
Move assets/(css|js)/* into (css|js)/*

Issue #69.
Import remaining www/*/Makefile.am files

... from pip-db, see: https://github.com/ChrisCummins/pip-db.

Issue #69.