Update README.md

Updated latest Maven version and documentation
IllegalArgumentException catched for PrimaryKey type mismatch
Added validation for AutoIncrement PrimaryKeys type, on failure
throws IllegalStateException showing the current and expected type
Merge pull request #4 from razorblade446/master

Minor error handling fix
[maven-release-plugin] prepare release persistence-0.9.23
[maven-release-plugin] prepare for next development iteration
Merge tag 'persistence-0.9.23'

[maven-release-plugin]  copy for tag persistence-0.9.23
Added travis config file
Added travis-ci image and updated doc
Added travis config file
Made create table sentence public
Reordered README.md

Well... I just want travis to test this branch.
[maven-release-plugin] prepare release persistence-0.9.24
[maven-release-plugin] prepare for next development iteration
Merge tag 'persistence-0.9.24'

[maven-release-plugin]  copy for tag persistence-0.9.24
Performance improvements by avoiding String.format method
Changed layout just for fun
Reestructured to add examples
Prepared for a JSR-269 implementation
Deleted examples