add Numeric#div, Numeric#divmod, and Numeric#modulo
tag new failing spec
Merge remote-tracking branch 'origin/master' into tim/numeric-div+mod
Making IO#readline behave better-er

not including introduction of Yet Another Bad IO Buffering Implementation.
add Array#each_index
Merge pull request #467 from topazproject/tim/numeric-div+mod

Numeric div and modulo methods
Merge pull request #470 from modcloth/mbh/more-readline-touchup

Making IO#readline behave better-er
Convert floats to strings nicely
Some more passing specs.