Removed language_version from mspec.
Exposed ProfileFormatter for mspec help.
Removed implementation dependent example for equal matcher.

MRI 2.0 treats Floats as immediates if double-tagging is used.
Removed Gemfile.lock for mspec.

In RSpec, raise_error and raise_exception are aliases. Since "error"
is a more general term, it's reasonable that it matches "kinds of"
exceptions. Here, raise_exception is used to match only a specific
kind of exception. Any confusion that results will be short-lived
as MSpec 2.0 will use a different syntax.
Added raise_exception to MSpec.