Substrate.from() (#426)

* Substrate.from()

* Fix some transaction validation code

* must be more specific for matching now.

* Update `wasm-builder` and add `build-only-wasm` script

* Update to latest service builder interfaces

* ANother substrate update

* Another update

polkadot/scripts/build-only-wasm.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env sh
+
+# Script for building only the WASM binary of the given project.
+
+set -e
+
+PROJECT_ROOT=`git rev-parse --show-toplevel`
+
+if [ "$#" -lt 1 ]; then
+  echo "You need to pass the name of the crate you want to compile!"
+  exit 1
+fi
+
+WASM_BUILDER_RUNNER="$PROJECT_ROOT/target/release/wbuild-runner/$1"
+
+if [ -z "$2" ]; then
+  export WASM_TARGET_DIRECTORY=$(pwd)
+else
+  export WASM_TARGET_DIRECTORY=$2
+fi
+
+if [ -d $WASM_BUILDER_RUNNER ]; then
+  export DEBUG=false
+  export OUT_DIR="$PROJECT_ROOT/target/release/build"
+  cargo run --release --manifest-path="$WASM_BUILDER_RUNNER/Cargo.toml" \
+    | grep -vE "cargo:rerun-if-|Executing build command"
+else
+  cargo build --release -p $1
+fi