Copy Function Project content to new directory Azure#43 -- original a…

…zure-functions-pack feature request. 1. default output is "dist", can specify via -o option, 2. create the funciotn folder strcuture in the dist folder, 3. copy over the function.json file and makes the chagnes there. The orgianl funciton.json file keeps untouched. 4. Copy over the host.json file to dist folder. In summary the dist folder contains the structure which is redy for uploading to azure. Node: unpack has not been tested.