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This will prevent breaking the gemspec when gem-compiler runs.

See https://github.com/luislavena/gem-compiler/issues/12

Also related: #1275

Download libxml2 and libxslt via HTTP

This should close #848.

This is in response to questions on #551.

Fixes #1262.

on attribute insertion. Related to #1262.

This is to match their versions with what will be in the forthcoming
update of rake-compiler-dev-box:

	https://github.com/tjschuck/rake-compiler-dev-box/pull/20

Fixes #1124.
Signed-off-by: Jake Byman <jakebyman@yahoo.com>

JRuby should handle parsing an object that responds to #read.
Signed-off-by: Jake Byman <jakebyman@yahoo.com>

because I broke it in 0924a56d when trying to refactor. *headdesk*

previously used for the old `nokogiri.org` site.

Revert of d6791465.

Fixes #1228.