Revert "Override toString for PreparedStatement and BoundStatement (JAVA-115)."

This reverts commit 2cca684fcacbd222fc1bfd98677f2336d3ce9b63.
Add test for negative open connection count (JAVA-349)
Merge pull request #223 from pingtimeout/2.0.

Add test for negative open connection count (JAVA-349)
Added more tests for conditional queries (JAVA-358)