Use python-libstorj bindings in EasyStorj GUI

[lakewik]

I started to integrate python-libstorj bindings to EasyStorj. EasyStorj will have two upload and download modes: native python and binding mode because libstorj-c have some adventages like Reed-Solomon erasure encoding but also some disadventages like unability to set max shard size, retry count, informations about download/upload progress for each shard, concurrency - but i going to also add these functionalities to libstorj-c in future,

[marcorosa]

Good! I guess we should do this in another branch. Moreover, please note that actual version of uploading and downloading of the python-bindings are not working (they're still WIP)

[lakewik]

Yes, i tested it and we will start implementing working features like buckets and file listing :)