Automate build step (#1551)

* remove note that was fixed in #1526

* add build script

* add prepack script

* remove custom compilation steps

scripts/build.sh

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+
+# Configure to exit script as soon as a command fails.
+set -o errexit
+
+# Clean the existing build directory.
+rm -rf build
+
+# Create a temporary directory to place ignored files (e.g. examples).
+tmp_dir="$(mktemp -dp.)"
+
+# Move the ignored files to the temporary directory.
+while IFS="" read -r ignored
+do
+  mv "contracts/$ignored" "$tmp_dir"
+done < contracts/.npmignore
+
+# Compile everything else.
+node_modules/.bin/truffle compile
+
+# Return ignored files to their place.
+mv "$tmp_dir/"* contracts/
+
+# Delete the temporary directory.
+rmdir "$tmp_dir"