Sync .spec file from ibs to github. Use the same spec file. Version 3.1.3
Modify spec file with right buildrequires.
Merge pull request #15 from nick-wang/master

Merged. I don't know if i don't increase the version of the later commit, whether it will be auto commit to ibs with the first commit. So i increase the version number of both commits,so that make sure the later commit can submit to ibs.