Merge pull request #80 from krachtvoll/master

[TASK] added export function to AdministrationController refs #52
[TASK] Added more default fields to csv export - Closes #82
[TASK] Renamed method exportToCsvFile in export service and fixed CGL issues
[TASK] Refactored CSV export to use FAL with full test coverage - Closes #81
[TASK] Adde csv export icon to admin listview - Closes #83
[TASK] Made all fields in flexform optional, since the mandatory icon is not shown in the correct place - Closes #67
[TASK] Added prefill viewhelper for fe_user data - Refs #55
[TASK] Added check to viewHelper if form contains validation errors - Refs #55
[TASK] Added prefill viewhelper to template - Closes #55
[TASK] Added icon and action to handle expired registrations in backend module - Closes #65
[TASK] Removed long comment - Closes #84
[TASK] Raised version number to 0.5.0-dev - Closes #85
[TASK] Added extension icons - Closes #42
[TASK] Added build.xml file
[TASK] Removed build.xml file