Add some misses I found

Signed-off-by: Nathan LeClaire <nathan.leclaire@gmail.com>

.dockerignore

@@ -1,2 +1,2 @@
-machine*
+docker-machine*
 .git

.gitignore

@@ -1 +1 @@
-machine*
+docker-machine*

ROADMAP.md

@@ -19,6 +19,6 @@ There are two main areas for future development:
 
  - **Swarm integration:** Machine should be able to create and manage [Swarm](https://github.com/docker/swarm) clusters. Perhaps it's even the default. Imagine this:
 
-        $ machine create -d digitalocean production
-        $ machine scale production=100
+        $ docker-machine create -d digitalocean production
+        $ docker-machine scale production=100
 

script/build

@@ -7,6 +7,6 @@ else
     OS_ARCH_ARG=($1)
 fi
 
-rm -f machine_*
+rm -f docker-machine*
 docker build -t docker-machine .
 exec docker run --rm -v `pwd`:/go/src/github.com/docker/machine docker-machine gox "${OS_ARCH_ARG[@]}" -output="docker-machine_{{.OS}}-{{.Arch}}"