v1.15.0

• Tabs in query page refactored and now part of cbioportal-frontend repo:
  • plots
  • network (inside iframe)
  • bookmarks
  • expression
• Updated MutationMapper tool to connect to Genome Nexus for annotating mutations on the fly
• Total Mutations and Fraction Genome Altered are available in plots tab
• Enhanced clinical attribute selector for Oncoprint, now showing sample counts per attribute