beam/examples/beamsh: add a few example dockerscripts

Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)

pkg/beam/examples/beamsh/demo1.ds

@@ -0,0 +1,9 @@
+#!/usr/bin/env beamsh
+
+devnull {
+	multiprint {
+			exec tail -f /var/log/system.log &
+			exec ls -l
+			exec ls ksdhfkjdshf jksdfhkjsdhf
+	}
+}

pkg/beam/examples/beamsh/helloworld.ds

@@ -2,7 +2,7 @@
 
 print {
 	trace {
-		emit hello
-		emit world
+		emit msg=hello
+		emit msg=world
 	}
 }

pkg/beam/examples/beamsh/logdemo.ds

@@ -0,0 +1,9 @@
+#!/usr/bin/env beamsh
+
+trace {
+	log {
+		exec ls -l
+		exec ls /tmp/jhsdfkjhsdjkfhsdjkfhsdjkkhsdjkf
+		echo hello world
+	}
+}