[BUGFIX] iterator.container should also search in key of array

Fixes #123
[FEATURE] Add considerKeys as attribute of VH Iterator/Contains
Merge pull request #130 from NamelessCoder/iteratorcontains

[FEATURE] Toggle for iterator.contains to search keys instead of values
[FEATURE] Uri / Request ViewHelper
Merge pull request #133 from krur/dev

[FEATURE] Uri / Request ViewHelper
[DOC] Adjust sub package doc comment, Uri / Request ViewHelper