Remove unused "bitcoinconsenus" feature.

Also I've updated the feature name on the README.md, and fixed a typo in
src/blockdata/script.rs

Signed-off-by: Jean Pierre Dudey <jeandudey@hotmail.com>

Cargo.toml

@@ -16,7 +16,6 @@ name = "bitcoin"
 path = "src/lib.rs"
 
 [features]
-bitcoinconsenus = ["bitcoinconsensus"]
 fuzztarget = ["secp256k1/fuzztarget"]
 
 [dependencies]

README.md

@@ -74,7 +74,7 @@ downstream users to also have a `num` dependency just so they can use `Uint256::
 
 * Removed old script interpreter
 
-* A new optional feature "bitcoinconsenus" lets this library use Bitcoin Core's native
+* A new optional feature "bitcoinconsensus" lets this library use Bitcoin Core's native
 script verifier, wrappend into Rust by the rust-bitcoinconsenus project. 
 See `Transaction::verify` and `Script::verify` methods.
 

src/blockdata/script.rs

@@ -183,7 +183,7 @@ impl error::Error for Error {
             Error::EarlyEndOfScript => "unexpected end of script",
             Error::NumericOverflow => "numeric overflow (number on stack larger than 4 bytes)",
             #[cfg(feature="bitcoinconsensus")]
-            Error::BitcoinConsensus(ref _n) => "bitcoinconsenus verification failed",
+            Error::BitcoinConsensus(ref _n) => "bitcoinconsensus verification failed",
             #[cfg(feature="bitcoinconsensus")]
             Error::UnknownSpentTransaction (ref _hash) => "unknown transaction referred in Transaction::verify()",
             #[cfg(feature="bitcoinconsensus")]