Stop testing 32-bit on travis

This has been broken for quite awhile now on 32-bit linux due to what looks like
libcurl going awry. This can be reactivated later, but consistently green travis
builds are more important right now.

Additionally, we already have coverage on the buildbots for 32-bit flavors of
architectures.
Fix some copy-paste errors in CLI help
auto merge of #752 : alexcrichton/cargo/typos, r=alexcrichton
line up the comments
auto merge of #754 : blaenk/cargo/whitespace, r=alexcrichton

I missed this when I changed the values to the defaults! It simply lines up the comment with the one above it.
auto merge of #750 : alexcrichton/cargo/no-more-travis-32, r=alexcrichton

This has been broken for quite awhile now on 32-bit linux due to what looks like
libcurl going awry. This can be reactivated later, but consistently green travis
builds are more important right now.

Additionally, we already have coverage on the buildbots for 32-bit flavors of
architectures.
cargo new: Don't create a git repo in subdirectory

Running `cargo new` to create a subpackage shouldn't create another
git repository if one exists in a parent directory.

Closes #664
auto merge of #755 : pwoolcoc/cargo/fix-664, r=alexcrichton
Implement platform-specific dependencies