challenge code: Model, some fix.
dao challenge code.
DAO Pattern -> Data Mapper Pattern.
delete old files.
fix sample controller.
add Entry, fix UserMapper const.
add test framework
Usage:
$ vagrant ssh
$ cd /var/www/tests
$ phpunit
ignore .vagrant
ignore DS_Store
Merge branch 'hot-fix'

Conflicts:
	.gitignore
	.idea/workspace.xml
conflict fix .gitignore