feat(ssl): redesign SSL usage

BREAKING CHANGE: Server::https was changed to allow any implementation
  of Ssl. Server in general was also changed. HttpConnector no longer
  uses SSL; using HttpsConnector instead.

Cargo.toml

@@ -12,22 +12,33 @@ authors = ["Sean McArthur <sean.monstar@gmail.com>",
 keywords = ["http", "hyper", "hyperium"]
 
 [dependencies]
-cookie = "0.1"
 httparse = "0.1"
 log = "0.3"
-mime = "0.0.11"
+mime = "0.0.12"
 num_cpus = "0.2"
-openssl = "0.6"
 rustc-serialize = "0.3"
 time = "0.1"
-unicase = "0.1"
-url = "0.2"
 traitobject = "0.0.1"
 typeable = "0.1"
-solicit = "0.2"
+unicase = "0.1"
+url = "0.2"
+
+[dependencies.cookie]
+version = "0.1"
+default-features = false
+
+[dependencies.openssl]
+version = "0.6"
+optional = true
+
+[dependencies.solicit]
+version = "0.3"
+default-features = false
 
 [dev-dependencies]
 env_logger = "*"
 
 [features]
+default = ["ssl"]
+ssl = ["openssl", "cookie/secure", "solicit/openssl"]
 nightly = []