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)
Improve doc for ResultSet#wasApplied (JAVA-358).
Fix cluster shutdown (JAVA-445).
Merge pull request #224 from pingtimeout/2.0

Added more tests for conditional queries (JAVA-358)
Expose child policy in chainable load balancing policies (JAVA-439).
[maven-release-plugin] prepare release 2.0.6
[maven-release-plugin] prepare for next development iteration
Add size() method to BatchStatement class.

Since BatchStatement#getStatements() returns an immutable copy,
and that is probably a good design decision, then lets add a
size() method so that we don't need to create a copy by calling
batch.getStatements().size() in order to get the current number
of statements in the batch.
Bump Cassandra test version to 2.0.10.
Handle null pool in PooledConnection.release (JAVA-449).
Initialize changelog for 2.0.7.