Merge branch 'tjanson-ghp-relative-paths' into gh-pages
[GHPages] install instruction for python3 users

Additional instruction for python3 users (i.e., pretty much everyone), because `gyp` hates python3 and makes no attempt to find python2.
changed 'PI' to 'Pi'; that's the official sp.
install instr. updated w/ prebuilt node, mongo

Added instructions to install Node.js and MongoDB from prebuilt
packages; updated regular instructions. See ni-c/heimcontrol.js#92
wintersmith rebuild
wintersmith rebuild
wintersmith rebuild
Revert "wintersmith rebuild"

This reverts commit 7ca825d8b616f8bf046890bfa118dd33d9df7c0e, reversing
changes made to 17109f37c629ac5520e73e6af316dafc9796e362.
replaced "PI" with "Pi" in gh-pages

(this really is Revert "Revert "wintersmith rebuild"", but I just
wanted to change the commit msg)

This reverts commit 7e875cf495ec12edd4370da68073d7cb7a306f74.
python3/node-gyp instructions for building node

(Merge remote-tracking branch 'origin/patch-2' into gh-pages)

Conflicts:
	src/templates/get-started.jade
Merge commit '7392431873f37aa2fd901bb32121b1ddb62da7ec' into ghp-install-prebuilt
wintersmith rebuild
fixed hidden paragraph