v256

Code changes:

• Ongoing work on supporting VCF+tabix format. (Angie)
• Added 4k readAhead buffer to UDC for speed-up. (Galt)
• Final touches on drag-n-zoom anywhere in image. (Larry)
• Final touches on drag-scroll x1. (Tim)
• Tweaks to UDC BAM fetch. (Andy)
• Small UI improvements to Track Data Hubs. (Brian, Greg)
• Started work to support returning browser image via URL. (Larry)
• Automatically re-size the browser image to fit the internet browser. (Larry)

Data changes:

• Updated all orgs to Ensembl Genes v63. (Hiram)
• deCODE Recombination track: hg18, hg19. (Hiram)
• CPG Islands for anoCar2. (Hiram)
• Started yeast browser (sacCer3). (Hiram)