[openstreetmap-website] Update install instructions (ruby 1.8.7 no longer possible due to gems) (#484)

[danstowell]

Some gems which we require (nokogiri, sanitize) now demand ruby >= 1.9.2. Therefore this patch removes ruby 1.8.7 as an option.

It also updates the list of packages to install on Ubuntu. I don't know if other systems need tweaking for this change.

You can merge this Pull Request by running:

  git pull https://github.com/danstowell/openstreetmap-website installdoc

Or you can view, comment on it, or merge it online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/484

-- Commit Summary --

  * Update install instructions (ruby 1.8.7 no longer possible due to gems)

-- File Changes --

    M INSTALL.md (7)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/484.patch
https://github.com/openstreetmap/openstreetmap-website/pull/484.diff
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