Hide Attach menu item on phones (#102)

... as it's redundant because of Options and Attachments entry.

skins/elastic/README.md

@@ -90,6 +90,9 @@ RULES:
 - Every button, that is not <button> nor <input> should have inner <span class="inner"> element
   for the button label.
 
+- Every iframe need to be wrapped by an element with `iframe-wrapper` class. It is
+  required to have proper scrolling on mobile devices.
+
 - Special attributes:
     - `data-hidden`: Makes a menu entry/button hidden on specified screen sizes.
       Can be used for example for functionality not implemented or that has no sense

skins/elastic/templates/compose.html

@@ -108,7 +108,8 @@
 				label="save" title="savemessage" tabindex="2" innerclass="inner" data-content-button="true" />
 			<span class="spacer"></span>
 			<roundcube:button name="addattachment" type="link" class="button attach"
-				label="attach" title="addattachment" onclick="if (!$(this).is('.disabled')) rcmail.upload_input('uploadform')"
+				label="attach" title="addattachment" data-hidden="small"
+				onclick="if (!$(this).is('.disabled')) rcmail.upload_input('uploadform')"
 				aria-haspopup="true" aria-expanded="false" tabindex="2" innerclass="inner" />
 			<roundcube:button command="insert-sig" type="link" class="button signature disabled" classAct="button signature"
 				label="signature" title="insertsignature" tabindex="2" innerclass="inner" />