Import from bugzilla.mozilla.org bug 958814, a fix for install_app.py.
Add a FastEventLog.jsm module (untested, but should be close to workable) to assist in quickly debugging event logs of any kind.  Also, move TreeViews.jsm earlier in the build.
Bug fixes to FastEventLog.jsm.
Implement merge operations for asynchronous transactions in the 'do' phase.