automatically call init_iruby

requires IRuby master for now
Add Frame#to_iruby, Plot#to_iruby

- This allows automatic plotting by just returning the Plot/Frame object
- Plot#show and Frame#show calls IRuby#display
Corrected proceed_data to process_data, fixes #9
Made it so CSVs store symbols instead of strings for headers (by
default). Fixed problem wherein an extra separator character produces a
nil hash key.
Allowed user to set mark size
Add spec for diagram
Merge pull request #12 from mohawkjohn/symbol_fix

Made it so CSVs store symbols instead of strings for headers
Merge pull request #13 from mohawkjohn/scatter_size

Scatter size user-settable
Merge #11
Add more test for DataFrame
Fix bug on Nyaplot3d
Modify example
Fix specs to work when they are excuted individually
Update README.md
Merge pull request #18 from kozo2/patch-1

Update README.md
Add Bionya
Merge branch 'master' of github.com:domitry/Nyaplot
Add min and max to Nyaplot::Series
Add the feature to load extension libraries that depend on Nyaplotjs
Add ruby interface for Bionya