Merge master into docwhat-homebrew-yaml

Conflicts:
	share/ruby-build/1.9.1-p378
	share/ruby-build/1.9.1-p430
	share/ruby-build/1.9.2-p0
	share/ruby-build/1.9.2-p180
	share/ruby-build/1.9.2-p290
	share/ruby-build/1.9.2-p318
	share/ruby-build/1.9.2-p320
	share/ruby-build/1.9.3-p0
	share/ruby-build/1.9.3-p125
	share/ruby-build/1.9.3-p194
	share/ruby-build/1.9.3-p286
	share/ruby-build/1.9.3-p327
	share/ruby-build/1.9.3-p362
	share/ruby-build/1.9.3-p374
	share/ruby-build/1.9.3-p385
	share/ruby-build/1.9.3-p392
	share/ruby-build/1.9.3-p429
	share/ruby-build/1.9.3-p448
	share/ruby-build/1.9.3-preview1
	share/ruby-build/1.9.3-rc1
	share/ruby-build/2.0.0-preview1