Move the generated gyp stuff to .gitignore.
Move the generated gyp stuff to .gitignore.

There's probably more for other platforms, but this covers OS X.

robcolburn/node-weak,KenanSulayman/node-weak,TooTallNate/node-weak,unbornchikken/node-weak,unbornchikken/node-weak,TooTallNate/node-weak,kkoopa/node-weak,fastest963/node-weak,robcolburn/node-weak,TooTallNate/node-weak,EvolveLabs/electron-weak,robcolburn/node-weak,unbornchikken/node-weak,fastest963/node-weak,kkoopa/node-weak,KenanSulayman/node-weak,KenanSulayman/node-weak,EvolveLabs/electron-weak,fastest963/node-weak,kkoopa/node-weak,EvolveLabs/electron-weak