Adding deleteItems function.
Adding header.
FIxes bug in the html test.
Moves delete Item to Abstract.
Coding style fix.
Merge pull request #175 from doleiynyk/2013-05-08_implement_deleteItems

Implements delete items for all managers
Merge https://github.com/Arcavias/arcavias-core into 2013-05-14_bundles_fix