use _contains rather than _indexOf where appropriate
update R.isEmpty to return true for 0, -0, and NaN
extract logic common to R.lPartial and R.rPartial
replace for loops with while loops to match Ramda style
Merge pull request #532 from davidchambers/contains

use _contains rather than _indexOf where appropriate
Merge pull request #535 from davidchambers/loops

replace for loops with while loops to match Ramda style
Merge pull request #533 from davidchambers/is-empty

update R.isEmpty to return true for 0, -0, and NaN
Merge pull request #534 from davidchambers/partial

extract logic common to R.lPartial and R.rPartial
fix converge doc to accept 2 functions