Merge pull request #4 from screeper/master

Added update "column = !column"
Add _bindParam internal helper function
Style fixes
New sample CRUD index.php and some readme updates
added test for join
Small doc change
Streamline where generation part
Allow multiply where parameters
Fix notice
Really sanitize orderBy and groupBy values
Allow Underscore char in orderBy/groupBy filter as its a legit symbol in names
Mark 2.0 release to differentiate ajillion and my version
Added ping() with reconnect abbility
More relaxed filtering for rawQuery()
Enclose field names into quotes for reserve keywords usage in INSERT/UPDATE
Added not in and not between cases
Fix warning on update if update data have only function calls
Added boolean variables support
update readme with boolean examples
Allow to use where () without value parameter