Update Demo
Begin a changes log (#18)
Switch to the "hspec" testing framework
Reproduce the bug in a test
Fix the bug
Merge branch 'transaction-conflict-fix' into 0.4

* transaction-conflict-fix:
  Fix the bug
  Reproduce the bug in a test
Release
Merge branch '0.4'

* 0.4:
  Release
  Fix the bug
  Reproduce the bug in a test
  Switch to the "hspec" testing framework
  Begin a changes log (#18)
  Update Demo