Revert "and yet more renaming"

This reverts commit 75ddb1e578679eba409dcafd5378a0ea376dd004.

Conflicts:
	R/data.R
	man/uspop2000.Rd

Revert "rename the package to leafletjs"

This reverts commit 77ff582d653e0699925e537699672f14a8a3eb17.

Conflicts:
	README.md