Release 4.1.0

Don't block usage of xunit with file since it has been fixed (mochajs…

…/mocha#2005)

Tag v4.0.1

Merge v4 into master

Resore fix for #167 in a minor version bump

Tag v3.5.6

Tag v3.5.5

Tag v3.5.4

Switch over to phantomjs2

Prepare for 3.5.3 Release