web server is required to develop with JS API

because of underlying dojo changes, sample apps need to be accessed over
http, so a web server is a requirement as well.

added item (and relevant link to the help)
web server is required to develop with JS API

because of underlying dojo changes, sample apps need to be accessed over
http, so a web server is a requirement as well.

added item (and relevant link to the help)
Merge pull request #24 from jgravois/master

added new item to readme requirements