add feature for mentions

features/mentions.feature

+@javascript
+Feature: Mentions
+  As user
+  I want to mention another user and have a link to them
+  To show people that this person exsists.
+
+  Scenario: A user mentions another user and it displays correctly 
+    Given a user named "Bob Jones" with email "bob@bob.bob"
+    And a user named "Alice Smith" with email "alice@alice.alice"
+    And a user with email "bob@bob.bob" is connected with "alice@alice.alice"
+    And Alice has a post mentioning Bob
+    When I sign in as "alice@alice.alice"
+    And I am on the home page
+    And I follow "Bob Jones"
+    Then I should see "Bob Jones"

features/step_definitions/mention_steps.rb

+And /^Alice has a post mentioning Bob$/ do
+  alice = User.find_by_email 'alice@alice.alice'
+  bob = User.find_by_email 'bob@bob.bob'
+  aspect = alice.aspects.first
+  alice.post(:status_message, :text => "@{Bob Jones; #{bob.person.diaspora_handle}}", :to => alice.aspects.first)
+end
+
+When /^I fill in a mention for bob into the publisher$/ do
+  bob = User.find_by_email 'bob@bob.bob'
+  And 'I fill in "status_message_fake_text" with "Hi, @{Bob Jones; #{bob.person.diaspora_handle}} long time no see'
+end