Use Ructe (#327)

All the template are now compiled at compile-time with the `ructe` crate.

I preferred to use it instead of askama because it allows more complex Rust expressions, where askama only supports a small subset of expressions and doesn't allow them everywhere (for instance, `{{ macro!() | filter }}` would result in a parsing error).

The diff is quite huge, but there is normally no changes in functionality.

Fixes #161 and unblocks #110 and #273

plume-common/Cargo.toml

@@ -11,11 +11,11 @@ array_tool = "1.0"
 base64 = "0.9"
 failure = "0.1"
 failure_derive = "0.1"
-gettext-rs = "0.4"
 heck = "0.3.0"
 hex = "0.3"
 hyper = "0.11.27"
 openssl = "0.10.11"
+rocket = "0.4.0-rc.1"
 reqwest = "0.9"
 serde = "1.0"
 serde_derive = "1.0"
@@ -28,7 +28,3 @@ version = "0.4"
 [dependencies.pulldown-cmark]
 default-features = false
 version = "0.1.2"
-
-[dependencies.rocket]
-git = "https://github.com/SergioBenitez/Rocket"
-rev = "55459db7732b9a240826a5c120c650f87e3372ce"