Add tests for String.to_integer and String.to_float
Add tests for String.to_integer and String.to_float

beedub/elixir,gfvcastro/elixir,kelvinst/elixir,joshprice/elixir,gfvcastro/elixir,lexmag/elixir,antipax/elixir,ggcampinho/elixir,kelvinst/elixir,michalmuskala/elixir,kimshrier/elixir,lexmag/elixir,kimshrier/elixir,ggcampinho/elixir,pedrosnk/elixir,antipax/elixir,elixir-lang/elixir,beedub/elixir,pedrosnk/elixir