Switched to basho lager.

Now depends on exo 1.1, which is needed for bert_rpc_exec to work cor…

…rectly.

Moved tag to version with added xref exception.

Merge branch 'master' of github.com:Feuerlabs/bert

allow e.g. {tcp,Opts} in Protos, send_timeout defaults

Moved public include file to its correct position

Merge commit 'c79fd0a'

removed checked in rebar (buggy and old), fixed makefile to access an…

…y rebar installed, modernized rebar.config.script

proplists:get_bool() -> get_value()