Fixed issue where validate_uniqueness_of created invalid sql when column name was a mysql reserved word
added fixtures for valuestore also for sqlite pgsql and oci
The ActiveRecord namespace doesn't follow PSR-0 conventions, so Composer's "psr-0" autoloader fails to autoload classes.

Fortunately, loading the `ActiveRecord.php` file loads the common dependencies and registers an autoloader The Old Fashioned Way, and Composer has a config option for that.
Removed unused line
Merge pull request #228 from fetch/quoted_validations

validate_uniqueness_of created now works on column with reserved mysql words
Rethrow PDOException instead of PDOStatement as DatabaseException
Added highlighting by using typed code blocks
Merge pull request #239 from ethos-development/master

Composer's autoload mechanism fails to load PHP-ActiveRecord classes
Merge pull request #254 from koenpunt/patch-2

Added syntax highlighting in README by using typed code blocks
Merge pull request #247 from fetch/informative-exception

Rethrow PDOException instead of PDOStatement as DatabaseException