fix sliceplus compatibility issues with djang-rest-framework 3.x
fix sliceplus compatibility issues with djang-rest-framework 3.x

jermowery/xos,cboling/xos,xmaruto/mcord,cboling/xos,jermowery/xos,jermowery/xos,xmaruto/mcord,cboling/xos,jermowery/xos,cboling/xos,xmaruto/mcord,xmaruto/mcord,cboling/xos