GOLD-645: Finish tweaking INSTALL.rst.
GOLD-645: Finish tweaking INSTALL.rst.

slashk/goldstone-server,slashk/goldstone-server,Solinea/goldstone-server,slashk/goldstone-server,slashk/goldstone-server,Solinea/goldstone-server,slashk/goldstone-server,Solinea/goldstone-server,Solinea/goldstone-server,Solinea/goldstone-server