Appveyor build control (#2125)
Appveyor build control (#2125)

* Don't build on doc or website edits

We are running appveyor for testing integration with Windows. No need to run tests if only the docs or website have changed.

* Append --build-all to PR / commit msg, builds all examples

* Comments and testing --build-all

danielfarrell/gatsby,gatsbyjs/gatsby,ChristopherBiscardi/gatsby,fabrictech/gatsby,gatsbyjs/gatsby,ChristopherBiscardi/gatsby,mingaldrichgan/gatsby,ChristopherBiscardi/gatsby,danielfarrell/gatsby,fk/gatsby,gatsbyjs/gatsby,0x80/gatsby,fabrictech/gatsby,mingaldrichgan/gatsby,0x80/gatsby,mickeyreiss/gatsby,gatsbyjs/gatsby,Khaledgarbaya/gatsby,ChristopherBiscardi/gatsby,gatsbyjs/gatsby,Khaledgarbaya/gatsby,mickeyreiss/gatsby,mickeyreiss/gatsby,fk/gatsby,gatsbyjs/gatsby,danielfarrell/gatsby,0x80/gatsby,fk/gatsby,Khaledgarbaya/gatsby,fabrictech/gatsby,mingaldrichgan/gatsby