The node version was updated in DEVELOPER.md due to #4527,
but nvm still uses v0.12 if not specified otherwise.
Update .nvmrc file to v4.2, which is the last node version.
Closes#4894
The .nvmrc file is used by nvm if you don't specify a version. This lets us type Found '/Users/alexeagle/Projects/angular/.nvmrc' with version <0.12>
Now using node v0.12.2. It doesn't check that you are using the node version from the file, however, so this won't prevent version skew.
See https://github.com/creationix/nvm#usagecloses#1995