Append'em

New:

• Implements support for @append extension (see, e.g. core-pegjs
  in the for-GET project)

Updated:

• Fix for Unicode code points in pegjs_parse.pegjs
• Fix for invalid initializers

Fix Unicode for literals and \u sequences

0.2.1

Fix \u Unicode sequences

Bootstrapped and self-contained

pegjs is now using itself to generate it's own parser