win,msi: rename node.exe to iojs.exe
win,msi: rename node.exe to iojs.exe

This change is strictly limited to the name of the binary. The shortcut
name, install folder, docs website links etc. are all unchanged.

PR-URL: https://github.com/iojs/io.js/pull/263
Reviewed-By: Ben Noordhuis <59bd0a3ff43b32849b319e645d4798d8a5d1e889@bnoordhuis.nl>

dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node