[FEATURE] Add date range and interval ViewHelpers
[TASK] Remove obsolete files
[TASK] Refactor viewhelper

These changes should reflect the discussion in #154
[TASK] Rename attribute "dateFormat" to "format" on Format / DateRange ViewHelper

In addition, expand a chained variable assignment for better clarity.
[DOC] Add doc block for Format / DateRange ViewHelper
Merge pull request #4 from NamelessCoder/spaceglue

[TASK] Rename attribute "dateFormat" to "format" on Format / DateRange ViewHelper
[TASK] Correct package namespace
[TASK] Remove superfluous properties
Merge pull request #154 from bjo3rnf/spaceglue

[FEATURE] Add date range and interval ViewHelpers
[TASK] Add missing @throws annotations
[TASK] Remove unused variables
[DOC] Typo in comment
[TASK] Remove superfluous return statement
[TASK] Correct @param annotations
[TASK] Correct variable name
[TASK] Remove superfluous quotes
[TASK] Adhere coding guidelines
[TASK] Correct @param annotation
Merge pull request #156 from bjo3rnf/housekeeping

[TASK] More code cleaning
[BUGFIX] Fix early return