update UploadCsarService ref #105

*change implementation to use already existing csars
*rename UploadCsarService to UploadCsarFileService
Merge pull request #106 from eiselems/105

update UploadCsarService fixes #105
*change implementation to use already existing csars
*rename UploadCsarService to UploadCsarFileService
Refactored AbstractServlet
Merge pull request #107 from TKosch/abstract_servlet_improvement

Refactored AbstractServlet, no ticket reference

Extended AbstractService by adding getRoot() method which implements basic code
added datatables to layout, refs #108
Merge pull request #109 from przytads/108

added datatables to layout, fixes #108
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