Update beaver to fix bintray bug
Update beaver to fix bintray bug

This should fix #10.

* beaver 78e5c39(78e5c39)...f6c32f9(f6c32f9) (4 commits)
  > Update Dockerfiles to use the new tag scheme
  > bintray: Run upload command inside docker by default
  > bintray: Fix default value for -t TAG
  > bintray: Check for the jfrog tool

sociomantic-tsunami/ebtree,sociomantic-tsunami/ebtree