Update Gemfile (sass 3.4.7 fixed).
Update Gemfile.lock.
v2.4.0
Bump rake to 10.4.
Update uglifier to 2.6.
Update Jekyll to 2.5.
Update bundle.
Update highlightjs to 8.4.
v2.4.1
Merge tag 'v2.4.1'

Conflicts:
	Gemfile.lock