Predefined cells

[jmks]

A couple automatons for #4

$ golife blinker
$ golife blocker

Here's a couple things that could be done here, or moved to new issues:

• what if the automaton can not be drawn in the playground? eg Playgrounds::Blinker.build(1, 1)

From the command line, if you ask for a specific automaton then the playground should be large enough to contain it, rather than the default of 10 x 10.

• if the pattern type is not defined, eg golife undefined_type, it falls back to a random pattern

It might be nicer if the printed playground included the pattern name so you know what you're looking at.

[vs4vijay]

Hey @jmks , Can we chat on hangout(vs4vijay -[at]- gmail [dot] com) or Skype(vs4vijay)... Need to share few thoughts about the code and features..