Using fethType in xml for consistency.
Docs for #149
Support multiple key properties in @SelectKey
Fixes #159. Remove external cache locking.
Fixes #158. Use namespace for cache logging.
Related to https://code.google.com/p/mybatis/issues/detail?id=448.
CacheKey should be created with the same order than the
DefaultParameterHandler handles parameters.
Mimic DefaultParameterHandler logic when calculating the CacheKey
Add support for selectKey and generated keys in update statements
Add XML mapper for selectKey update tests
Merge pull request #160 from jeffgbutler/issue_154

Changes for #154 - Enhanced Support for Optimistic Locking
Some doc updates for #154
Minor fixes