Removing Glencoe link & pointing ppl at homebrew
Tidying suggested by Mark
Removing out-of-date ref to tar.bz2 files
Tidying Windows installation page while I'm at it
ICE -> Ice
Missed one! ICE -> Ice
Merge pull request #611 from hflynn/rebased/dev_5_0/glencoe_link

Removing link to out-of-date Ice binaries at Glencoe (rebased onto dev_5_0)