rename R.repeatN and revert argument order

As discussed in #626

> Only trouble I see is that we wanted the ability to make custom builds that included some of these extensions as desired. Not sharing a code-base will make this trickier, no?

We needn't conflate the two. If a user wants to use a custom Ramda build such as `--category list` along with ramda/lazylist, she is of course free to do so. There's no reason to combine these into a single file. That's best left to a dedicated build tool, as one will no doubt want to bundle one's application files as well.