[FEATURE] Add form field name viewhelper

As requested and discussed in #99
[DOC] Fix time-warp
[DOC] Add viewhelper description
[DOC] Correct argument descriptions
[BUGFIX] Fix monkey on keyboard

Just renamed FieldNameViewHelper to proper casing
[TASK] Add method to detect variable namespace
[BUGFIX] Add missing method
[BUGFIX] Use local variable
[TASK] Inject persistence manager
Merge pull request #270 from bjo3rnf/formfieldname

[FEATURE] Add form field name viewhelper