Implements iChain authentication

app/views/users/edit.html.haml

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+%h1 Edit your profile
+.row
+  .col-md-12
+    = semantic_form_for(@user, url: user_path(@user.id)) do |f|
+      = f.inputs name: 'Profile' do
+        = f.input :name, as: :string
+        = f.input :nickname, as: :string
+        = f.input :affiliation, as: :string,
+          hint: 'This could be a company, a user group, or nothing at all.'
+        = f.input :biography,  input_html: { rows: 5, 'onkeyup' => "word_count(this, 'biography-count', 150)" }
+        You have used
+        %span#bio_length
+          0
+        words.  Biographies are limited to 150 words.
+        %br
+        %br
+      = f.action :submit, as: :button, label: 'Update', button_html: {class: 'btn btn-primary'}

app/views/users/show.html.haml

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+%h1
+  = @user.name
+%h4
+  = @user.biography
+
+- if @user.events.confirmed.any?
+  %h3
+    = "#{@user.name} presents #{pluralize(@user.events.confirmed.count, 'Event')}:"
+  %ul.list-unstyled
+    - @user.events.confirmed.each do |event|
+      %li
+        %h4
+          = link_to event.title, conference_proposal_path(event.conference.short_title, event.id)
+          %strong
+            at
+          = event.conference.title