making the remotestorage.js git url lower-case

[anyt...@michielbdejong.com]

Hi!

We will soon move g...@github.com:RemoteStorage/remoteStorage.js.git to
g...@github.com:remotestorage/remotestorage.js.git so if you have a local
checkout of that repo you will need to adjust your .git/config file
next
time you do a 'git pull'.

https://github.com/RemoteStorage/remotestorage.io/issues/23


Cheers,
Michiel