Fix test for rspec version 3.3.0 In order for the tests to run on rspec 3.3.0, it was necessary to update the rspec methods be_false and be_true to be_falsey and be_truthy, respectivelly. Also, it was necessary to change the shared_as blocks for shared_context ones, since it is the new way for rspec tests.
This fix will not be sent to the upstream, because the tool being used to hold the source code doesn't seem to allow merge requests.
