changes to facilitate beta builds on dev.  Appropriating beta target, and assuming that USER=beta exists on dev.
Merge branch 'master' of hgwdev.cse.ucsc.edu:/data/git/kent
Registering track handlers for snp138 tables.
change make beta to update both hgwbeta and hgwdev-beta
Merge remote-tracking branch upstream/$:{upbranch}