Delete old log engine
Run all specs
Fix specs

Not all specs were being run, because I accidentally commited a change
in spec/spec.js file. After enabling all of the specs it turned out that
2 of them are failing and it seems that it was caused by cloneNode on a
fragment. I'm not sure why was it added in the first place, but
cloneNode is needed on DocumentFragment only if a given fragment will be
reused which is not the case here
Add autoCloseFold option to log

autoCloseFold option controls weather a fold is open or not after it's
completed. By default it's true, which means that fold will not get
"open" class, ie. it will be closed after fold end is received