Add testing on different tarantool versions

[Totktonada]

1_9, 1_10 and 2x at least.

I siggest to use a variable with packagecloud bucket (don't sure about the name) in test.sh that is set in a travis job (in .travis.yml).

Setup weekly ('cron') run on Travis-CI and exclude packages build from it (see the example here).

[Totktonada]

I would do it similarly to tarantool-php.

[Totktonada]

Let's implement #182 first.

[Totktonada]

Superseded by #182 and #198.