pass in data as an arg when initializing a cell object

[kellyredding]

(this is another great request from @naleksi)

Hello again!

Here's another tweak I tried to get working, but unfortunately I failed. Many tests on higher up in the hierarchy than Cell itself fails. Take a look at the test below and you see what I tried to get accomplished, ie. no need to give data within the block but immediately in the initialization.

naleksi@b36e4b7

Let me know if you think this is a good idea or could be tweaked working. I'll send you a push request.

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This idea here is that you can choose to specify a cell object with data by passing the data as an arg, kinda like so:

cell(some_data) do
  # some other cell attributes
end

Currently, the only way to specify data for a cell is to use a DSL-style attribute, like so:

cell do
  data some_data
  # some other cell attributes
end