Merge pull request #27 from johnoliver/master

Add test harness for creating deadlocks
allows the database to be switchable
Merge pull request #28 from johnoliver/master

add exercise that logs in and out of webapp
adds in postgres config and deletes hibernate dialect nonsense
Merge branch 'master' of https://github.com/jClarity/slow-crud-app
Merge pull request #29 from RichardWarburton/master

Slays enterprise dragons, fixes #4
add exercise for cpu intensive problem