Updates OSFUser social_links Property
Updates OSFUser social_links Property

* social_links will provide formatted social URLs for all social fields
* social_links will return a single url for social services that permit multiple accounts
* social_links will enforce typing dictated by SOCIAL_FIELDS

brianjgeiger/osf.io,Johnetordoff/osf.io,mattclark/osf.io,baylee-d/osf.io,CenterForOpenScience/osf.io,saradbowman/osf.io,cslzchen/osf.io,baylee-d/osf.io,baylee-d/osf.io,Johnetordoff/osf.io,mfraezz/osf.io,adlius/osf.io,brianjgeiger/osf.io,Johnetordoff/osf.io,mfraezz/osf.io,saradbowman/osf.io,mattclark/osf.io,adlius/osf.io,Johnetordoff/osf.io,mfraezz/osf.io,cslzchen/osf.io,cslzchen/osf.io,mattclark/osf.io,CenterForOpenScience/osf.io,brianjgeiger/osf.io,CenterForOpenScience/osf.io,felliott/osf.io,felliott/osf.io,CenterForOpenScience/osf.io,adlius/osf.io,brianjgeiger/osf.io,felliott/osf.io,felliott/osf.io,cslzchen/osf.io,adlius/osf.io,mfraezz/osf.io,aaxelb/osf.io,aaxelb/osf.io,aaxelb/osf.io,aaxelb/osf.io