deps: Update to a more recent rocket and rust toolchain

With this patch, Plume will be use a more up-to-date revision of
Rocket, that works with nightly-2018-07-17. It may have been able to
make it work with a more recent revision, but it turns out rocket has
introduced several breaking changes so I’d rather fix those.

Besides updating rocket_i18n and rocket_csrf to use the same revision
than Plume, this patch deals with the new implementation of the
Uri<'_> type. It silents a class of warnings, to deal with a change in
rustc which affects diesel. This latter change should be reverted as
soon as diesel releases a new version of its crate.

plume-common/Cargo.toml

@@ -14,10 +14,10 @@ failure_derive = "0.1"
 gettext-rs = "0.4"
 heck = "0.3.0"
 hex = "0.3"
-hyper = "*"
-openssl = "0.10.6"
+hyper = "0.11.27"
+openssl = "0.10.11"
 reqwest = "0.8"
-serde = "*"
+serde = "1.0"
 serde_derive = "1.0"
 serde_json = "1.0"
 
@@ -31,4 +31,4 @@ version = "0.1.2"
 
 [dependencies.rocket]
 git = "https://github.com/SergioBenitez/Rocket"
-rev = "df7111143e466c18d1f56377a8d9530a5a306aba"
+rev = "55459db7732b9a240826a5c120c650f87e3372ce"