Better RSpec integration

[jakubkosinski]

• removed see! and not_see! methods
• added custom matchers (see and see_table)

Custom matchers can be chained. Example code:

scenario "inspecting contents" do
  user = Bbq::TestUser.new
  user.visit "/"
  user.should see("Header").within("h1")
  user.should see_table("table").with_content([
    ["#", "First name", "Last name"]
  ]).in_header
end