ADD: error message view helper
DEL. debug message
ADD: viewhelper for short link
CHG: use new error code method for captcha string validator
TASK: Raise minimum TYPO3 version number to 6.2.99
TASK: Upload Version 1.5.3 to TER
Merge branch 'develop' of https://github.com/punktDe/pt_extbase into develop
TASK: Upload Version 1.5.4 to TER