Add .gitignore to ignore buffer files
Ignore .swp file for Vim
Use soft-tabs with a two space indent:

cf. [Ruby Styleguide](https://github.com/styleguide/ruby)
Add magic comments to encode and execute:

- Need information on how to encode before Ruby
- Declare explicitly how to run the code for `./iscandar.rb`
Align each line vertically to be understandable for being human:

cf. [The Art of Readable Code - Simple and Practical Techniques for Writing Better Code](http://shop.oreilly.com/product/9780596802301.do)
Add a comment on how to name variables
Merge pull request #1 from yasulab/master

ザックリとコメントしてみました。