Fix for #44 - Placeholder at the last position of statement causing crash

Patch received from Daniel Beaudoin (Optel Vision) on 23/07/2012)
Merge remote-tracking branch 'upstream/master'
Fixed #48 - Incorrect assertion in postgresql::get_error_details. Patch received from Fedor Trushkin.
Added _build* pattern to .gitignore.

There is build in top-level directory of the source tree, so we can't
ignore build globally. To make in-source build subfolders usable without
annoying Git prompts about unstaged changes, we can use _build and its
variants (_build-{branch}-{build type}, etc.). It will be ignored.
Update .travis.yml to install unixodbc-dev -  #49
Added Travis CI build status badge
[SQLite3] Report test6() as skipped
Merge branch 'master' of github.com:SOCI/soci
Renamed README to README.md and switched format to Markdown.
Merge branch 'master' of github.com:SOCI/soci
Update .travis.yml to Install odbc-postgresql driver
Configured DSN for SOCI ODBC connection to PostgreSQL in order to run ODBC tests on Travis CI (#49)
Update .travis.yml with corrected .dsn path (#49)
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
Added and updated test log messages
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