Support of Proxy ENV variables

Signed-off-by: Aymeric Brisse <aymeric.brisse@perfect-memory.com>
Remove duplicate line into the Gemfile

Signed-off-by: Aymeric Brisse <aymeric.brisse@perfect-memory.com>
Bump to version 0.1.3

Signed-off-by: Aymeric Brisse <aymeric.brisse@perfect-memory.com>