Update build script

Adapted from Packer's build script

build.sh

@@ -1,8 +1,49 @@
+#!/bin/bash
+#
+# This script builds the application from source for multiple platforms.
+# Adapted from from packer/scripts/build.sh
+
+# Determine the arch/os combos we're building for
 XC_OS=${XC_OS:-$(go env GOOS)}
 XC_ARCH=${XC_ARCH:-$(go env GOARCH)}
 
+# Install dependencies
+echo "==> Getting dependencies..."
+go get ./...
+
+# Delete the old dir
+echo "==> Removing old directory..."
+rm -f bin/*
+rm -rf pkg/*
+mkdir -p bin/
+
 gox \
     -os="${XC_OS}" \
     -arch="${XC_ARCH}" \
-    -output "build/{{.OS}}_{{.Arch}}/packer-{{.Dir}}" \
-    ./...
+    -output "pkg/{{.OS}}_{{.Arch}}/packer-{{.Dir}}" \
+    ./... \
+    || exit 1
+
+# Move all the compiled things to the $GOPATH/bin
+GOPATH=${GOPATH:-$(go env GOPATH)}
+case $(uname) in
+    CYGWIN*)
+        GOPATH="$(cygpath $GOPATH)"
+        ;;
+esac
+OLDIFS=$IFS
+IFS=: MAIN_GOPATH=($GOPATH)
+IFS=$OLDIFS
+
+# Copy our OS/Arch to the bin/ directory
+echo "==> Copying binaries for this platform..."
+DEV_PLATFORM="./pkg/$(go env GOOS)_$(go env GOARCH)"
+for F in $(find ${DEV_PLATFORM} -mindepth 1 -maxdepth 1 -type f); do
+    cp ${F} bin/
+    cp ${F} ${MAIN_GOPATH}/bin/
+done
+
+# Done!
+echo
+echo "==> Results:"
+ls -hl bin/