Update contributor profiles

* Adds a new page for updating profiles
* Refactors the add-contributor component to allow for updating
  existing contributors
* Adds input labels to the contributor form and improves placeholders
* Adds event handlers for all contract contributor changes and uses them
  for updating the UI

refs #122

app/components/add-contributor/template.hbs

@@ -1,62 +1,50 @@
 <form {{action "submit" on="submit"}}>
   <p>
-    {{input name="account"
-            type="text"
+    <label for="c-account">Ethereum account</label>
+    {{input name="account" id="c-account"
+            type="text" value=account
             placeholder="0xF18E631Ea191aE4ebE70046Fcb01a436554421BA4"
-            value=account
             class=(if isValidAccount "valid" "")}}
   </p>
   <p>
-    <select required onchange={{action (mut kind) value="target.value"}}>
+    <label for="c-kind">Kind</label>
+    <select required onchange={{action (mut kind) value="target.value"}} id="c-kind">
       <option value="person" selected={{eq kind "person"}}>Person</option>
       <option value="organization" selected={{eq kind "organization"}}>Organization</option>
     </select>
   </p>
   <p>
-    {{input name="name"
-            type="text"
-            placeholder="Name"
-            value=name
-            class=(if isValidName "valid" "")}}
+    <label for="c-name">Name</label>
+    {{input name="name" type="text" value=name placeholder="Zero Cool"
+            class=(if isValidName "valid" "") id="c-name"}}
   </p>
   <p>
-    {{input name="url"
-            type="text"
-            placeholder="URL"
-            value=url
-            class=(if isValidURL "valid" "")}}
+    <label for="c-url">URL</label>
+    {{input name="url" type="text" value=url placeholder="http://zerocool.bit"
+            class=(if isValidURL "valid" "") id="c-url"}}
   </p>
   <p>
-    {{input name="github_uid"
-            type="text"
-            placeholder="GitHub UID (123)"
-            value=github_uid
-            class=(if isValidGithubUID "valid" "")}}
+    <label for="c-github-uid">GitHub UID</label>
+    {{input name="github_uid" type="text" value=github_uid placeholder="2342"
+            class=(if isValidGithubUID "valid" "") id="c-github-uid"}}
   </p>
   <p>
-    {{input name="github_username"
-            type="text"
-            placeholder="GitHub username"
-            value=github_username
-            class=(if isValidGithubUsername "valid" "")}}
+    <label for="c-github-username">GitHub username</label>
+    {{input name="github_username" type="text" value=github_username placeholder="zerocool"
+            class=(if isValidGithubUsername "valid" "") id="c-github-username"}}
   </p>
   <p>
-    {{input name="gitea_username"
-            type="text"
-            placeholder="Gitea username"
-            value=gitea_username
-            class=(if isValidGiteaUsername "valid" "")}}
+    <label for="c-gitea-username">Gitea username</label>
+    {{input name="gitea_username" type="text" value=gitea_username placeholder="zerocool"
+            class=(if isValidGiteaUsername "valid" "") id="c-gitea-username"}}
   </p>
   <p>
-    {{input name="wiki_username"
-            type="text"
-            placeholder="Wiki Username"
-            value=wiki_username
-            class=(if isValidWikiUsername "valid" "")}}
+    <label for="c-wiki-username">Wiki username</label>
+    {{input name="wiki_username" type="text" value=wiki_username placeholder="ZeroCool"
+            class=(if isValidWikiUsername "valid" "") id="c-wiki-username"}}
   </p>
   <p class="actions">
-    {{input type="submit"
-            disabled=inProgress
+    {{input type="submit" disabled=inProgress
             value=(if inProgress "Processing" "Save")}}
   </p>
 </form>