NQP, parse grammars, actions

NQP
* purpose
* compilation example
* declaring variables
* binding
* if/then/else
* while
* for
* subroutines + subroutine calls
* methods + method calls
* Q:PIR

Grammars
* regular expression basics
* major changes from p5
  * whitespace
  * quoting / metachars
  * grouping
  * enumerated character class
* named regexes
* regex, token, rule, whitespace
* no left-recursion
* capturing
* match objects
* quantified captures

Action methods
* meaning of {*} token
* defining action methods
* keys
* make