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/lambda/create.md

@@ -0,0 +1,22 @@
+# Creating Docker images out of Lambda functions
+Docker images created by running the `create-function` subcommand on a Lambda function are ready to execute. 
+
+You can convert any Lambda function of type nodejs 0.10, python 2.7 and Java 8 into an
+IronFunction compatible Docker Image as follows:
+```bash
+fnctl lambda create-function <name> <runtime> <handler> <files...>
+```
+
+* name: the name of the created docker image which should have the format `<username>/<image-name>`
+* runtime: any of the following `nodejs`, `python2.7` or `java8`
+* handler: a handler takes a different form per runtime
+    * java8: `<namespace>.<class>::<handler>`
+    * python2.7:  `<filename>.<handler>`
+    * nodejs: `<filename>.<handler>`
+* file: the files to be converted, however for java8 only one file of type `jar` is allowed.
+
+e.g:
+```bash
+fnctl lambda create-function irontest/node-exec:1 nodejs node_exec.handler node_exec.js
+```
+