nukehawtness: add cd to rst

If you're not in the directory, cd into it

Change-Id: I34f2eda21f6e0604e690a5288960d0dd4dca84ab
Change default kernel gcc version to 4.7... in the grossest way possible.

Change-Id: I039fef345a7a470d0d5769ebb79c252d09a38a99