Fix: Remove vim instruction (#880)

Refactor gpg key organization

add title

add download link for the public keyring

Cleanup version.inc

With this diff, version.inc will ONLY export one "variable" named
$RELEASES which will continue to have the same format as previous.

It will also export a he

Cleanup version.inc

With this diff, version.inc will ONLY export one "variable" named
$RELEASES which will continue to have the same format as previous.

It will also export a helper method named release_get_latest()
for quickly accessing the most recent version published.

All other globals previously exported by this function are
no longer used on web-php.

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Swap uses of _SERVER[DOCUMENT_ROOT] for __DIR__

1/n - Update / and /include/ only.

Only show GPG keys for active branches on the downloads page.

GPG keys have been moved into a new include file, and a new page has been added
to access GPG keys for older branches.