Properly compute LIBDIR on (modern) Debian

While Fedora considers "lib" and "lib64" reasonable settings for LIBDIR[1]
the Debian people dismissed that setup in favor of a more scalable
approach[2]. They install libraries to lib/${arch}-linux-gnu.

This patch addresses that difference.

1: http://fedoraproject.org/wiki/PackagingDrafts/MultilibTricks
2: https://wiki.ubuntu.com/MultiarchSpec#Filesystem_layout
Merge pull request #55 from hasselmm/debian-multiarch-libdir

Properly compute LIBDIR on (modern) Debian
Merge branch 'master' of github.com:SOCI/soci
Updated README.md with brief history of SOCI :)
Update README.md

Linked to Maciej at Inspirel
Update README.md
Update README.md
fix to build the Firebird backend on Ubuntu
Merge pull request #56 from vnaydionov/master

Fix to build the Firebird backend
Added License section
Merge remote-tracking branch 'upstream/master'