[FEATURE] Option to return tt_content records instead of rendered elements

Added new function getRenderedRecord to separate creating record content from query to fetch tt_content records
Added new arguments to abstract View Helper: render, using to returning array of tt_content records (render true, default)

Based on #81 FluidTYPO3/flux/issues
[FEATURE] Attribute "render" to return records, Content ViewHelper.
[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