Merge branch 'release/2.1.1'
Fix issue #726
Fix a issue with affect_rows in CI_DB_pdo_driver::_execute()

In case of SELECT queries PDOStatement::rowCount doesn't work as expected. This commit
makes affect_rows be initialized properly.

Signed-off-by: Rogerio Prado de Jesus <rogeriopradoj@gmail.com>
Fix a issue with CI_DB_pdo_result::num_rows()

In case of SELECT queries PDOStatement::rowCount doesn't work as expected. This commit
makes it returns the expected value.
Merge pull request #1331 from rogeriopradoj/patch-1

Workaround for PDO Driver in 2.1-stable: num_rows doesn't work for SELECT queries
Added ability to _like paramater side to use 'none', in case one wants to query like instead of where without case being sensitive
Removed the starting slash from uri_string() documentation.
Adding width and height to list of clear variables to fix #1059
Updating change log relating to #1059.
Merge pull request #1389 from jamiefdhurst/2.1-stable

Adding width and height to list of clear variables to fix #1059
Fix issue #1387
Stop travis trying to run unit tests on 2.1-stable.
Merge branch '2.1-stable' of github.com:EllisLab/CodeIgniter into 2.1-stable
Fix an erroneus method name
Driver_Library had $lib_name set as static, and used non-static
Merge branch '2.1-stable' of github.com:EllisLab/CodeIgniter into 2.1-stable
Adding IPv6 support to the Input and Form_validation libraries.
Documenting IPv6 changes and adding update notes.
Fixed valid_ip() for PHP < 5.2
Revert a change