Add missing move constructor to GlobalRef.
Add missing move constructor to GlobalRef.

Fixes compile error on MSVC2013.

happybits/djinni,pwais/djinni,anzihenry/djinni,DEGoodmanWilson/djinni,pwais/djinni,PSPDFKit-labs/djinni,ragnraok/djinni,DEGoodmanWilson/djinni,ragnraok/djinni,NachoSoto/djinni,zaren678/djinni,iRobotCorporation/djinni,iRobotCorporation/djinni,mknejp/djinni,iRobotCorporation/djinni,trafi/djinni,dropbox/djinni,PSPDFKit-labs/djinni,trafi/djinni,trafi/djinni,dropbox/djinni,NachoSoto/djinni,csimmons0/djinni,jeremiahyan/djinni,aijiekj/djinni,NachoSoto/djinni,jrogers/djinni,mknejp/djinni,Wattpad/djinni,mknejp/djinni,anzihenry/djinni,aijiekj/djinni,Wattpad/djinni,jrogers/djinni,jeremiahyan/djinni,dropbox/djinni,mrdomino/djinni,DEGoodmanWilson/djinni,csimmons0/djinni,mrdomino/djinni,zaren678/djinni,trafi/djinni,happybits/djinni,happybits/djinni,mknejp/djinni,mrdomino/djinni,jeremiahyan/djinni,tobefuturer/djinni,NachoSoto/djinni,Wattpad/djinni,iRobotCorporation/djinni,csimmons0/djinni,pwais/djinni,pwais/djinni,PSPDFKit-labs/djinni,anzihenry/djinni,Wattpad/djinni,ragnraok/djinni,tobefuturer/djinni,aijiekj/djinni,zaren678/djinni,jeremiahyan/djinni,jrogers/djinni,dropbox/djinni,csimmons0/djinni,zaren678/djinni,dropbox/djinni,PSPDFKit-labs/djinni,PSPDFKit-labs/djinni,ragnraok/djinni,tobefuturer/djinni,DEGoodmanWilson/djinni,tobefuturer/djinni,mrdomino/djinni,csimmons0/djinni,aijiekj/djinni,jrogers/djinni,trafi/djinni,happybits/djinni,anzihenry/djinni,happybits/djinni