Bug#676402: build dependencies

[Praveen A <pravi.a@gmail.com>]

needs newer rspec, it failed with rspec 2.10 currently in debian,
after installing rspec 2.11 it worked. It also needs autotest gem.

Running tests for ruby1.8 using debian/ruby-tests.rake ...
rake aborted!
no such file to load -- rspec/core/rake_task

or

/media/forge/debian/diaspora/ruby-rspec-rails-2.11.4/lib/rspec/rails.rb:1:in
`require': no such file to load -- rspec/core (LoadError)
	from /media/forge/debian/diaspora/ruby-rspec-rails-2.11.4/lib/rspec/rails.rb:1
	from ./spec/spec_helper.rb:8:in `require'
	from ./spec/spec_helper.rb:8
	from debian/ruby-tests.rb:7:in `require'
	from debian/ruby-tests.rb:7
	from debian/ruby-tests.rb:7:in `each'
	from debian/ruby-tests.rb:7

but runs successfully for ruby 1.9.1. I would mark it only ruby1.9.1 for now.
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