Merge pull request #359 from NamelessCoder/dev-namespaces

[TASK] Switch to namespaces
Merge pull request #378 from FluidTYPO3/dev-namespaces

[TASK] Switch to namespaces in master branch
[TASK] Rename Utility classes to suffix Utility to class name
[TASK] Rename ViewHelpers

Renames:

flux:flexform -> flux:form
flux:flexform.field.* -> flux:field.*
flux:flexform.field.wizard -> flux:wizard.*
flux:flexform.* -> flux:form.*