add owin to nuspec
add owin to nuspec

alibad/IdentityManager.vNext,jerryhuffman/IdentityManager,jerryhuffman/IdentityManager,alibad/IdentityManager.vNext,alibad/IdentityManager.vNext,Nicholi/IdentityManager,nexbit/IdentityManager,Ernesto99/IdentityManager,Ernesto99/IdentityManager,IdentityManager/IdentityManager,Nicholi/IdentityManager,Nicholi/IdentityManager,IdentityManager/IdentityManager,jerryhuffman/IdentityManager,IdentityManager/IdentityManager,nexbit/IdentityManager,nexbit/IdentityManager,Ernesto99/IdentityManager