Deprecations Cleared

Well, all except one. I left:

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The semantics of `described_class` in a nested `describe <SomeClass>`
example group are changing in RSpec 3. In RSpec 2.x, `described_class`
would return the outermost described class (Radiant::Extension).
In RSpec 3, it will return the innermost described class (BasicExtension).
In general, we recommend not describing multiple classes or objects in a
nested manner as it creates confusion.

To make your code compatible with RSpec 3, change from `described_class` to a reference
to `BasicExtension`, or change the arg of the inner `describe` to a string.
(Called from /home/vagrant/.gem/ruby/2.1/gems/rspec-its-1.0.1/lib/rspec/its.rb:88:in `block (2 levels) in its')
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in place as a reminder that the extension specs need special attention. All the rest are cleared.