Fixed and updated PropEr dependency to version 1.1
Updated bcrypt dependency to a more maintained fork
Added a Makefile and changed the default behavior for the usage of ./rebar
Added Travis CI support
Added newer rebar binary compiled with an older version of Erlang
Add Travis build status image and small tweak of build instructions
Bumping to 1.0.0

This has been used in production by enough people for long enough to be
worth making officially 1.0.0, especially with the latest patches for
up-to-date dependencies.