Properly encode spaces in mailto urls.

Apparently + is just how you used to encode spaces in aim:
urls in 1999, not in mailto: links.

(imported from commit 156708378e6b1d6955063a0979c8bee9d5b0e849)

templates/zephyr/apps.html

@@ -42,7 +42,7 @@
         <p>Humbug has a <strong>100% native app</strong> for iPhone,
           and we're in the process of getting it into the App Store.
           For now,
-          please <a target="_blank" href="mailto:support@humbughq.com?subject=Request+for+Humbug+iPhone+app&body=Hi+Humbug,+can+you+send+me+a+link+to+the+iPhone+app+alpha?+I+have+an+iPhone+__.">email
+          please <a target="_blank" href="mailto:support@humbughq.com?subject=Request%20for%20Humbug%20iPhone%20app&body=Hi%20Humbug,%20can%20you%20send%20me%20a%20link%20to%20the%20iPhone%20app%20alpha?%20I%20have%20an%20iPhone%20__.">email
           us to request access</a>.</p>
       </div>
 
@@ -99,7 +99,7 @@
         we're hiring. Please send us a resume and any other relevant
         information (a GitHub account, a portfolio, etc.)
         to <a target="_blank"
-        href="mailto:jobs@humbughq.com?subject=Humbug+for+Plan+9">jobs@humbughq.com</a>
+        href="mailto:jobs@humbughq.com?subject=Humbug%20for%20Plan%209">jobs@humbughq.com</a>
         and we'll be in touch!</p>
       </div>
 

templates/zephyr/jobs/lead-designer.html

@@ -50,7 +50,7 @@
         <i class="icon-white icon-pencil"></i> Apply now</a></center>
 
     <br />
-    <p>Questions? Please email us at <a href="mailto:jobs@humbughq.com?subject=Lead+designer+job+posting">jobs@humbughq.com</a>.</p>
+    <p>Questions? Please email us at <a href="mailto:jobs@humbughq.com?subject=Lead%20designer%20job%20posting">jobs@humbughq.com</a>.</p>
 
     </div>
 </div>