Scala Collector: Expire the cookie after a year.
Scala Collector: Preserve the UUID in the Cookie if already set.
Scala Collector: Add a timeout handler. Slightly clean imports and code.
Scala Collector: Add specs2 and spray test-kit to test libraries.
Scala Collector: Add short test case. Temporarily refactor package name due to error initializing the Actor system in the tests.

[error] Could not create an instance of com.snowplowanalytics.scala_collector.CollectorServiceSpec
[error]   caused by java.lang.Exception: Could not instantiate class com.snowplowanalytics.scala_collector.CollectorServiceSpec: i, n, v, a, l, i, d,  , A, c, t, o, r, S, y, s, t, e, m,  , n, a, m, e,  , [, c, o, m, -, s, n, o, w, p, l, o, w, a, n, a, l, y, t, i, c, s, -, s, c, a, l, a, _, c, o, l, l, e, c, t, o, r, -, C, o, l, l, e, c, t, o, r, S, e, r, v, i, c, e, S, p, e, c, ], ,,  , m, u, s, t,  , c, o, n, t, a, i, n,  , o, n, l, y,  , w, o, r, d,  , c, h, a, r, a, c, t, e, r, s,  , (, i, ., e, .,  , [, a, -, z, A, -, Z, 0, -, 9, ],  , p, l, u, s,  , n, o, n, -, l, e, a, d, i, n, g,  , ', -, ', )