Introduce working myweb.io annotation processor

Change-Id: I903de41d5169db310b951ba74b5f0ba1f3f8cc26
Remove commented out code
Rename module mywebio-example-module => mywebio-examples
Change communication direction between server and app

Now app acts as local socket server.
In example file manager serve files from path "/" instead of "/sd/"
Remove unused lines from build
Add configuration for publishing to local maven repo
Change target and sourceCompatibility to 1.6
Add support for JSONObject as response body
Fix serving data from @GET("/")
Remove unused code.
Serve "index.html" on request to "/"
Serve /services.json on GET / if there is no /index.html
Set application/json content when JSONObject is used body
filemanager: serve JSON with dir description
Remove method create() from HttpResonse (use ok() instead)
refactor: exctract some methods in ResponseBuilder
refactor: rename variable explicitLength => userDefinedLength
Make instantiateEndpoints() method private
Simplify abstract class Endpoint (remove some methods)