define R._ in every environment

There is a semantic difference between a nonexistent property and a
property whose value is undefined.
Simplify invoker and invokerN

- Let invoker take the method instead of name and object.
- Remove undefined-returning behavior.
Javascript → JavaScript

Grammar nazi mode on
curry Either constructor
rewrap Either in UMD
add missing @func tag
Merge pull request #396 from davidchambers/op

add missing @func tag
move JSHint and JSCS config to standalone JSON files
Merge pull request #386 from davidchambers/placeholder

define R._ in every environment
Merge pull request #374 from davidchambers/lint

move JSHint and JSCS config to standalone JSON files
Merge pull request #393 from anton-rudeshko/patch-1

Javascript → JavaScript
bind tests and impl
small fixes to bind impl and test
Merge branch 'bind'
add bind test to index
update docs for bind
Merge pull request #391 from fson/simplify-invoker

Simplify invoker and invokerN
pretty pretty badges
fixed most of bench task problems--but for one weird one
doc tweak for bind