Add Apache Commons FileUpload. Add first FileUploadUtil.
refs #81. Put Functionality into Servlet, no need for FileUploadUtil. Use UploadCsarService properly.
refs #81. Edit csardetailsservlet
refs #81. Add functionality of upload csar with servlets.
Merge pull request #103 from bigal91/81

Add Apache Commons FileUpload. Add first FileUploadUtil, fixes 103