[FEATURE] Add attribute "fail" on SingleMath ViewHelpers

This new flag allows suppression of the "required argument a not found" Exception - the new default behaviour is to suppress; the old behaviour can be restored by setting the attribute to TRUE.
Merge pull request #95 from NamelessCoder/master

[FEATURE] Add attribute "fail" on SingleMath ViewHelpers
Merge pull request #97 from dreipunktnull/master

[FEATURE] Add type convert viewhelper