Mysqli will return boolean true on success, insert() now checks this with $result !== true
Rewrote concatField value to an anonymous function to be passed to array_walk in the update function
This simplifies the class a bit
Simplified a few queries, also rewrote update to function without the array walk. It had an error, foreach now concats the string, it's the simplest solution without using array_walk and an extra function
Streamlined a few functions
Merge branch 'master' of https://github.com/RCreyghton/webdb.git