var _ = require('lodash'); - this doesn't work in Node

I suppose there is a misleading information in "Installation" section. If you try to do ```var _ = require('lodash')``` in Node, the variable ```_``` will be set to undefined. This is because ```_``` is the special variable in REPL (it contains the result of the last expression) and you can't assign it any value.

[See REPL docs.](http://nodejs.org/api/repl.html#repl_repl_features)
[Also see comments in this issue.](https://github.com/bestiejs/lodash/issues/88)