Mount /dev/shm as a tmpfs.

Fixes #1122.
Typo fix

Error message grammar tweak
Style fixes for fmt + err usage.

fmt.Printf and friends will automatically format using the error
interface (.Error()) preferentially; no need to do err.Error().
Merge pull request #1126 from karanlyons/patch-1

* Runtime: Mount /dev/shm as a tmpfs.
Merge pull request #1129 from cespare/style-fixes-2

Style fixes for fmt + err usage.
Revert #1126. Remove mount shm
Merge pull request #1127 from cespare/patch-1

Typo fix