Revert "#811 - reject pull requests against master: are you happy now make?"

This reverts commit bbe2549328053caf64f8e68cccb1f75ba71a267c.
Revert "#811 - reject pull requests against master: take 3"

This reverts commit 143e54b3155d3a654f3627459ec68b3d4ae2b2d9.
Revert "#811 - reject pull requests against master: take 2"

This reverts commit f926e64ccd2177bce0b3ea75a675bff00c032ca2.
Revert "#811 - reject pull requests against master"

This reverts commit 31ab0b224255aa6951561f663b6e443194359927.