More doc updates, explanation of serverless. (#228)

* More doc updates, explanation of serverless.

* Moved howto directory to examples and some minor doc updates.

* Added apps and routes docs.

* Fixes for Carlos' comments.

* Added bit about importing lambda functions.

docs/packaging.md

@@ -0,0 +1,50 @@
+# Packaging your Function
+
+Packaging a function has two parts:
+
+* Create a Docker image for your function with an ENTRYPOINT
+* Push your Docker image to a registry (Docker Hub by default)
+
+Once it's pushed to a registry, you can use it by referencing it when adding a route. 
+
+## Creating an image
+
+The basic Dockerfile for most languages is along these lines:
+
+```
+# Choose base image
+FROM iron/go
+# Set the working directory
+WORKDIR /function
+# Add your binary or code to the working directory
+ADD funcbin /function/
+# Set what will run when a container is started for this image
+ENTRYPOINT ["./funcbin"]
+```
+
+Then you simply build your function:
+
+```sh
+docker run --rm -v "$PWD":/go/src/$FUNCPKG -w /go/src/$FUNCPKG iron/go:dev go build -o funcbin
+docker build -t $USERNAME/myfunction .
+```
+
+Or using [fnctl](../fnctl/README.md):
+
+```sh
+fnctl build
+```
+
+## Push your image
+
+This part is simple:
+
+```sh
+docker push $USERNAME/myfunction 
+```
+
+Or using [fnctl](../fnctl/README.md):
+
+```sh
+fnctl push
+```