bump 2.2.1.rc4
bump 2.2.1.rc4

kaltura/mwEmbed,abaylis/mwEmbed,omridevk/mwEmbed,FlixMaster/mwEmbed,abaylis/mwEmbed,vladm3/mwEmbed,SVSG/mwEmbed,joanpuigsanz/mwEmbed,joanpuigsanz/mwEmbed,vladm3/mwEmbed,safarijv/mwEmbed,safarijv/mwEmbed,tanyaLibatter/mwEmbed,abaylis/mwEmbed,omridevk/mwEmbed,matsuu/mwEmbed,omridevk/mwEmbed,matsuu/mwEmbed,kaltura/mwEmbed,alexmilk/mwEmbed,DBezemer/mwEmbed,FlixMaster/mwEmbed,safarijv/mwEmbed,slash851/mwEmbed,alexmilk/mwEmbed,matsuu/mwEmbed,omridevk/mwEmbed,abaylis/mwEmbed,vladm3/mwEmbed,kaltura/mwEmbed,bordar/mwEmbed,tanyaLibatter/mwEmbed,FlixMaster/mwEmbed,joanpuigsanz/mwEmbed,SVSG/mwEmbed,panda-os/mwEmbed,slash851/mwEmbed,vladm3/mwEmbed,tanyaLibatter/mwEmbed,DBezemer/mwEmbed,DBezemer/mwEmbed,FlixMaster/mwEmbed,SVSG/mwEmbed,DBezemer/mwEmbed,kaltura/mwEmbed,safarijv/mwEmbed,panda-os/mwEmbed,bordar/mwEmbed,alexmilk/mwEmbed,panda-os/mwEmbed,slash851/mwEmbed,slash851/mwEmbed,tanyaLibatter/mwEmbed,bordar/mwEmbed,bordar/mwEmbed,panda-os/mwEmbed,joanpuigsanz/mwEmbed,SVSG/mwEmbed,matsuu/mwEmbed,alexmilk/mwEmbed