Add data/cache to gitignore
Fix syntax in sql schema
Change monolog to use line formatter

The logstash formatter is neat but makes for ugly apache error logs.
Use getPath() instead of getPathInfo()

getPath() == getPathInfo() on a root deploy but they are not the same
when deployed in a subdirectory.
Show mysql UTF-8 fix in README

The PDO mysql driver needs a `;charset=utf8` clause to correctly
interpret mysql results as UTF-8 encoded.