Added statistical functions to Array and improved delegation from Series
to Array.
Allowed Plot.new to take a block.
Fix a bug on zooming and solve #26
Merge branch 'array_monkeys' of github.com:mohawkjohn/nyaplot

Conflicts:
	lib/nyaplot/plot.rb
Fix bug on Array#modes
Switch map data from world.geo.json to geo-boundaries-world-110m
Fix typo
Fix bug on mapnya