title: Berksfile syntax questions
body: <p>I've been hunting for detailed documentation on what goes into a Berksfile, but all I've found is examples, and "you can do this" informal stuff.  (This includes the material at <a href="http://berkshelf.com" rel="nofollow">http://berkshelf.com</a> ...)</p>
  
  <p>Q1:  What is the basic syntax of a Berksfile?</p>
  
  <p>Q2:  What is the (complete) list of "declarations" that can go into a Berksfile?</p>
  
  <p>Q3:  A "cookbook" declaration takes an optional hash parameter.  What is the (complete) list of options that is supported by vanilla Berkshelf?</p>