Reimplement route attribute as a proc-macro.

This commits also implement the query reform from #608. It also consists
of many, many breaking changes. Among them are:

  * Query parts in route paths use new query reform syntax.
  * Routing for queries is now lenient.
    - Default ranking has changed to reflect query reform.
  * Format routing matching has been fixed.
    - Routes with formats matching "accept" will always collide.
    - Routes with formats matching "content-type" require requests to
      have an equivalent content-type header to match.
    - Requests with imprecise content-types are treated as not having a
      content-type.
  * Generated routes and catchers respect visibility modifiers.
  * Raw getter methods from request were renamed and retooled.
    - In particular, the index parameter is based on segments in the
      route path, not dynamic parameters.
  * The method-based attributes no longer accept a keyed 'path'.
  * The 'rocket_codegen' crate is gone and will no longer be public.
  * The 'FormItems' iterator emits values of type 'FormItem'.
    - The internal form items' string can no longer be retrieved.
  * In general, routes are more strictly validated.
  * Logging from codegen now funnels through logging infrastructure.
  * Routing has been optimized by caching routing metadata.

Resolves #93.
Resolves #608.
Resolves #693.
Resolves #476.

README.md

@@ -10,8 +10,7 @@ Rocket is web framework for Rust (nightly) with a focus on ease-of-use,
 expressibility, and speed. Here's an example of a complete Rocket application:
 
 ```rust
-#![feature(plugin, decl_macro)]
-#![plugin(rocket_codegen)]
+#![feature(proc_macro_non_items, proc_macro_gen, decl_macro)]
 
 #[macro_use] extern crate rocket;
 

contrib/codegen/src/database.rs

@@ -96,15 +96,15 @@ pub fn database_attr(attr: TokenStream, input: TokenStream) -> Result<TokenStrea
                     match pool {
                         Ok(Ok(p)) => Ok(rocket.manage(#pool_type(p))),
                         Err(config_error) => {
-                            ::rocket::logger::log_err(false,
+                            ::rocket::logger::log_error(
                                 &format!("Database configuration failure: '{}'", #name));
-                            ::rocket::logger::log_err(true, &format!("{}", config_error));
+                            ::rocket::logger::log_error_(&format!("{}", config_error));
                             Err(rocket)
                         },
                         Ok(Err(pool_error)) => {
-                            ::rocket::logger::log_err(false,
+                            ::rocket::logger::log_error(
                                 &format!("Failed to initialize pool for '{}'", #name));
-                            ::rocket::logger::log_err(true, &format!("{:?}", pool_error));
+                            ::rocket::logger::log_error_(&format!("{:?}", pool_error));
                             Err(rocket)
                         },
                     }

contrib/lib/src/lib.rs

@@ -41,8 +41,8 @@
 //! This crate is expected to grow with time, bringing in outside crates to be
 //! officially supported by Rocket.
 
-#[macro_use] extern crate log;
-#[macro_use] extern crate rocket;
+#[allow(unused_imports)] #[macro_use] extern crate log;
+#[allow(unused_imports)] #[macro_use] extern crate rocket;
 
 #[cfg(feature = "serde")]
 extern crate serde;