Added a lot of test cases for ModelFilter
Found out that ArrayAdapter has bugs when using the getFilter method. Will cease development in this branch and refactor to baseadapter in a new branch.
Working filter based on FilterableAdapter
Merged with dev
Merge conflict with stash
Working sort, with example test model
Prepared for merge back to dev
Update .gitignore
Optimization of database performance (insert/update/delete).
Merge branch 'dev' into dev-serverlayer

Conflicts:
	src/se/chalmers/lidkopingsh/database/OrderDbStorage.java
Merge
Added delete to producttype commented for better understanding