Split `curry` into two functions

`curry :: (* -> a) -> (* -> a)` for normal usage
`curryN :: Number -> (* -> a) -> (* -> a)` for variadic functions
remove R.isAtom
make travis run sauce conditionally
Merge pull request #363 from davidchambers/is-atom

remove R.isAtom
Merge pull request #362 from fson/curry-n

Split `curry` into two functions (v0.5.0)
remove redundant ios tests
correct ap behavior
correct ios browsers
fix version in browser config
add cloneObj (shallow)
Maybe ap with null :wshould return Maybe null
Maybe should not throw. jeez
expose isArrayLike
prepare to merge
merge v0.5.0