fix for #49, prep for 0.2.5
release 0.2.5
reject transaction promise if commit fails (fixes #50)
Merge pull request #52 from studds/master

reject transaction promise if commit fails (fixes #50)
prep for 0.2.6
release 0.2.6
Merge branch 'master' into migrate

* master:
  release 0.2.6
  prep for 0.2.6
  reject transaction promise if commit fails (fixes #50)
  release 0.2.5
  fix for #49, prep for 0.2.5