This reverts commit 125b1b0b.

Add documentation to Sprockets::NullCompressor and
Sprockets::LazyCompressor. Also, make LazyCompressor#compressor
private, as it isn't part of the public API.

Update changelogs for Rails 3.1.0

Previously, only "1" and "true" were accepted. This change makes
any value, or no value at all, have the same effect.

This commit broke the build without any improvement.

This reverts commit eb0b7147.

Add config.allow_debugging option to determine if the debug_assets query param can be passed by user

Use the Linus-style conditional. Also fix the documentation slightly.
Signed-off-by: NAndrew White <andyw@pixeltrix.co.uk>

params is a method, defined in every controller, which always returns a hash.
If it raises a NoMethodError, it means there's a bug somewhere else, which we want to know about.

This ensures that the protocol does not get carried over when there are
two or more requests in functional tests. This was a problem when e.g.
the first request was HTTP and the second request was HTTPS.

Closes #2654.
Signed-off-by: NAndrew White <andyw@pixeltrix.co.uk>

No need for them lines to get so long! Also, move that comment into
the method body where it belongs!

Fixes #2598