Add a changelog entry about changes in Array helper's element() and elements()
config->item() now returns NULL instead of FALSE when the required item doesn't exist.

Uniformization with other functions. This also brings the ability to properly use booleans in configuration.
Adjustments to the previous commit
Uniformize slash_item() with item()
Merge pull request #2554 from vlakoff/develop-3

config->item() now returns NULL instead of FALSE when the required item doesn't exist.