Revert new naming

[lilyball]

Rename the *::init() functions back to *::new(), since new is not
going to become a keyword.

[lilyball]

Running the rustpkg tests with logging, I see

/private/var/folders/cs/l6c6g06x0974_0w5pdg8dps80000gn/T/qPOPMYz68t9RECSptemp_workspace/src/cdep-0.1/main.rs:2:0: 2:18 error: the `link_args` attribute is not portable across platforms, it is recommended to use `#[link(name = "foo")]` instead
/private/var/folders/cs/l6c6g06x0974_0w5pdg8dps80000gn/T/qPOPMYz68t9RECSptemp_workspace/src/cdep-0.1/main.rs:2 extern { fn f(); } 
                                                                                                               ^~~~~~~~~~~~~~~~~~

This error is completely unrelated to my PR. Why isn't this test failing every single PR?

[lilyball]

@alexcrichton I had to force-push to update the Path::new commit to include the #[ignore]s that were added to the rustpkg tests in the reverted commit. Can you r+ again?

[lilyball]

Updated due to bitrot. r? @alexcrichton