New Building Structure

The main objective is to transform the building process into a more project oriented view.

To do that:
+ created a bin/elua (in python) that abstracts the usage of scons with the commands:
    elua --create <proj> <board>
    cd proj
    elua --build

--create: creates a conf.py that for now have BOARD="NAME" and a romfs/ folder. The elua now adds every file in the romfs, which I think is more intuitive to the user.
 Later on, if this path is accepted, the idea is to expand into a user level modules and components configuration that can be tuned for each project.

--build: Builds elua with the configuration from conf.py and the files from romfs/ and generates the image in the project folder.

So, to distribute an elua app the user only have to provide

conf.py
romfs/his_files.lua