Auto merge of #678 - servo:fitzgen-patch-1, r=emilio
Auto merge of #678 - servo:fitzgen-patch-1, r=emilio

Update ISSUE_TEMPLATE.md

Adds `<details>` (which github will make hidden by default, but is expandable) around the logs section.

A few minor other tweaks.

r? @emilio

emilio/rust-bindgen,emilio/rust-bindgen,rust-lang/rust-bindgen,emilio/rust-bindgen,rust-lang/rust-bindgen,rust-lang/rust-bindgen,emilio/rust-bindgen,emilio/rust-bindgen,rust-lang/rust-bindgen