Fix `:within` scope for RSpec-flavoured tests

[Fixes #31]
* Rewrite `see` matcher
* Allow to use `:within` option in RSpec version
  of Bbq::TestUser#see! and Bbq::TestUser#not_see!
Merge pull request #32 from ghandal/31-within-scope-not-working-in-rspec-flavored-tests

Fix `:within` scope for RSpec-flavoured tests
Fix chaining see rSpec matcher with within
Merge pull request #33 from ghandal/rspec-matchers-fix

Fix chaining see rSpec matcher with within
Bump version and update changes.
Release!
Focus on Capybara 2.0.

Capybara drops 1.8.7 support from this release, we should too having it
as a dependency.
There is MiniTest only on Ruby 1.9.
Loosen test dependencies.
Disable Jruby builds for now.

Running tests on Jruby would require test apps with jdbcsqlite3 adapter.
Cut the crap from readme.
More cleanup in README.
Remove Roundtrip reference from example.
RSpec integration example
RSpec integration example with widget methods

They were missing in this example and I don't want anybody to think that it's bbq's magic.
Merge pull request #34 from yashke/master

RSpec integration example