Fix Travis tests

[pviotti]

The local and distributed file system tests work locally and yet fail on Travis. Let's try to fix this.

[pviotti]

I've been testing locally with an obsolete version of antidotedb/antidote:latest. Updating it made me realize that the latest versions - even the 0.1.1 - has some data model incompatibility with the version I originally used to develop antidote-fs (0.1.0), which generates this kind of errors:

{{unknown_crdt_type_protobuf,9},[{antidote_pb_codec,decode_type,1,[{file,"/tmp/antidote/_build/default/lib/antidote_pb_codec/src/antidote_pb_codec.erl"},{line,553}]},{antidote_pb_codec,decode_bound_object,1,[{file,"/tmp/antidote/_build/default/lib/antidote_pb_codec/src/antidote_pb_codec.erl"},{line,399}]},{antidote_pb_codec,'-decode_message/1-lc$^2/1-2-',1,[{file,"/tmp/antidote/_build/default/lib/antidote_pb_codec/src/antidote_pb_codec.erl"},{line,213}]},{antidote_pb_codec,decode_message,1,[{file,"/tmp/antidote/_build/default/lib/antidote_pb_codec/src/antidote_pb_codec.erl"},{line,213}]},{antidote_pb_protocol,handle,3,[{file,"/tmp/antidote/_build/default/lib/antidote/src/antidote_pb_protocol.erl"},{line,72}]},{antidote_pb_protocol,loop,2,[{file,"/tmp/antidote/_build/default/lib/antidote/src/antidote_pb_protocol.erl"},{line,54}]}]}

The format of logs and their location in the container changed too - but that's a minor detail.
Unfortunately, the docker container for Antidote v0.1.0 is not published, which makes it difficult to have this project CI tests working at the moment.