Block parameters for Parser.new and Encoder.new

[padde]

Just wanted to sprinkle some syntactic sugar on the Parser and Encoder classes. Whereas now you would have to write

parser = Yajl::Parser.new
parser.on_parse_complete = lambda { |hash|
  # do something with hash
}

and

encoder = Yajl::Encoder.new
encoder.on_progress_callback = lambda { |str|
  # do something with str
}

this branch allows you to write

parser = Yajl::Parser.new do |hash|
  # do something with hash
end

and

encoder = Yajl::Encoder.new do |str|
  # do something with str
end

While I was at it, I

• fixed some typos and indentation in the comments
• found and fixed a bug that rendered on_progress_callback practically useless

The bug occurs because Encoder#encode takes a block parameter which sets on_progress_callback in the background. However, later on the block is called directly instead of referring to the on_progress_callback. This means that setting on_progress_callback before calling encode had no effect. This probably went unnoticed because there was no spec for that case but there is now. Check out padde@9ab456e.

Please comment on my branch and even if you don't like the block parameters, consider cherry-picking the other fixes.

Cheers