cleanup Project refs #135

*add static files to .gitignore
*add sbAdmin.zip
*mod pom.xml
*mod layout because of changed filepath
changed from exception to persistenceexception in all repositories and services, refs #87
Merge pull request #136 from przytads/87

change to PersistenceException in all repositories and services, fixes #87
Merge pull request #137 from eiselems/135

cleanup project, fixes #135

*add static files to .gitignore
*add sbAdmin.zip
*mod pom.xml
*mod layout because of changed filepath
Changed WebServlet names to static constant strings, refs #132
Merge pull request #138 from TKosch/132

Changed WebServlet names to static constant strings, fixes #132
Improved redirection of servlets after making some actions, refs #139
Merge pull request #140 from TKosch/139

Improved redirection of servlets after making some actions, fixes #139