ipfs files api files going missing

[dignifiedquire]

# With ipfs daemon running
$ ipfs add myfile
$ ipfs files cp /ipfs/<hash of myfile> /myfile
# kill daemon with 2 x ctrl-c 
# start daemon
$ ipfs files ls / 
# empty

[whyrusleeping]

This one is fixed in #2196. I havent merged it yet because i'm still stress testing it, but i beleive i've flushed out all the issues in the mfs code related to this