Removed some sub-sections. #46
Because description of the following usage was not mandatory.

* How to use the cache
* How to use the Plugin
* How to use Bulk update using the SqlSession
* How to use annotation
Added the note about local cache in MyBatis3. #46
Added the package name at some class name. #46
Added the link to go to web site of blank project in MyBatis3. #46
Added the note abount Repository interface in MyBatis3. #46
Added the directory path at some xml file name. #46
Modified the code-block highlight in MyBatis3. #46
Removed the unnecessary notes in MyBatis3. #46