Fix rule texts parsing

[fernandomm]

It was using squeeze method without any parameter which will squeeze all characters.

Texts like

Message-Id is not valid, according to RFC 2822

were parsed as

Mesage-Id is not valid, acording to RFC 282

Note that Message-Id was changed to Mesage-Id and RFC 2822 was changed to RFC 282.

As a bonus I corrected the tests in https://github.com/codefriar/RubySpamAssassin/blob/af6d81bdfe0a1438a1911f46d68b1ec3a5e262b6/spec/RubySpamAssassin/report_parser_spec.rb which weren't testing anything since they didn't used expect() method.

[mensfeld]

Ping. I could use this as well.