Improve failure messages in `tests/util.rs`

- Change so errors don't look where the last image was made (previously
the errors could point to non-existing places like
`\home\rustbuild..`)
Add git submodule update to README
Merge pull request #50 from Ygg01/fix_util_err

Improve failure messages in `tests/util.rs`
Upgrade to rustc 0.13.0-dev (a10917a6a 2014-10-24 17:32:04 +0000)
TTTok => TtToken
Upgrade to rustc 0.13.0-dev (77f44d4a7 2014-10-29 20:16:57 +0000)
Macro cleanup
Run the tree builder tests we don't fail

Prevent regressions.
rustup
Merge pull request #54 from cgaebel/rustup_20141105

rustup
rustup
rustup v2.
rustup v3
Merge pull request #55 from cgaebel/rustup_20141105

rustup
rustup
Upgrade to rustc 0.13.0-dev (c8d6e3b2c 2014-11-18 19:11:43 +0000)
rustup
Merge pull request #58 from cgaebel/rustup

rustup
rustup to rustc 0.13.0-nightly (395901393 2014-11-24 00:46:30 +0000)
add libtime