IntelliJ project files removed
use "./gradlew idea" to generate those files
ignore all IntelliJ files
Merge pull request #37 from Joerg-Schoemer/master

no more IntelliJ files in repo
fixed issue #50 (importers: add example file to download)
fixed issue #33 (page shakes at load time)
javadoc / comments
javadoc / comments
fixed issue #27 (Allow uploading of a zip file when importing multiple files)
feedback not visible
feedback not visible
Show a suitable Exception if the chosen username is already in use.
Required-Messages in propterties-files added
Trying to fix the wrong classname
Trying to fix the wrong classname and test
Show a suitable Exception if the chosen username is already in use.
Merge remote-tracking branch 'origin/master'

Conflicts:
	budgeteer-web-interface/src/main/java/org/wickedsource/budgeteer/web/pages/imports/fileimport/ImportFilesPage.html
	budgeteer-web-interface/src/test/java/org/wickedsource/budgeteer/service/user/UserServiceTest.java
Show a suitable Exception if the chosen username is already in use.