Stay on poltergeist 1.0.x on 1.8.7
Pass iframe errors up to the parent error handler (if there is one).
Update mocha (1.10.0)
Revert "Stay on poltergeist 1.0.x on 1.8.7"

This reverts commit f3145f54b6327ab8f7cadf0f48ee79499c5f0b0e.
Dropping 1.8.7 support
Release 3.0.0
Merge remote-tracking branch 'upstream/master' into origin/master