Merge pull request #5 from rafalchmiel/master

Added more library-like behaviour, updated README, updated examples, added ascii_charts feature (as discussed in issue #3)
add the hash display for the ascii chart
DRY up draw_percentage
Update benford.rb

remove extra space before Rafal notices it :)
Updated documentation
Merge pull request #7 from rafalchmiel/master

Shortened method
Merge pull request #8 from rafalchmiel/patch-1

Updated documentation
Tiny bit of refactoring + fixed spacing