refactor(client): remove experimental HTTP2 support

It didn't really work, and it had dangerous optional dependencies
(openssl), so for now, this is going away. HTTP2 should come back with
full support in the not-too-distant future.

BREAKING CHANGE: There is no more `hyper::http::h2`.

Cargo.toml

@@ -28,10 +28,6 @@ url = "1.0"
 version = "0.5"
 default-features = false
 
-[dependencies.solicit]
-version = "0.4"
-default-features = false
-
 [dev-dependencies]
 env_logger = "0.3"
 

src/error.rs

@@ -7,7 +7,6 @@ use std::string::FromUtf8Error;
 
 use httparse;
 use url;
-use solicit::http::HttpError as Http2Error;
 
 #[cfg(feature = "openssl")]
 use openssl::ssl::error::SslError;
@@ -21,7 +20,6 @@ use self::Error::{
     Io,
     Ssl,
     TooLarge,
-    Http2,
     Utf8
 };
 
@@ -49,8 +47,6 @@ pub enum Error {
     Io(IoError),
     /// An error from a SSL library.
     Ssl(Box<StdError + Send + Sync>),
-    /// An HTTP/2-specific error, coming from the `solicit` library.
-    Http2(Http2Error),
     /// Parsing a field as string failed
     Utf8(Utf8Error),
 
@@ -90,7 +86,6 @@ impl StdError for Error {
             Uri(ref e) => e.description(),
             Io(ref e) => e.description(),
             Ssl(ref e) => e.description(),
-            Http2(ref e) => e.description(),
             Utf8(ref e) => e.description(),
             Error::__Nonexhaustive(ref void) =>  match *void {}
         }
@@ -101,7 +96,6 @@ impl StdError for Error {
             Io(ref error) => Some(error),
             Ssl(ref error) => Some(&**error),
             Uri(ref error) => Some(error),
-            Http2(ref error) => Some(error),
             _ => None,
         }
     }
@@ -155,18 +149,11 @@ impl From<httparse::Error> for Error {
     }
 }
 
-impl From<Http2Error> for Error {
-    fn from(err: Http2Error) -> Error {
-        Error::Http2(err)
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use std::error::Error as StdError;
     use std::io;
     use httparse;
-    use solicit::http::HttpError as Http2Error;
     use url;
     use super::Error;
     use super::Error::*;
@@ -208,7 +195,6 @@ mod tests {
 
         from_and_cause!(io::Error::new(io::ErrorKind::Other, "other") => Io(..));
         from_and_cause!(url::ParseError::EmptyHost => Uri(..));
-        from_and_cause!(Http2Error::UnknownStreamId => Http2(..));
 
         from!(httparse::Error::HeaderName => Header);
         from!(httparse::Error::HeaderName => Header);