implement multiline input

src/skins/vector/css/molecules/MessageComposer.css

@@ -16,29 +16,25 @@ limitations under the License.
 
 .mx_MessageComposer_wrapper {
     max-width: 960px;
-    height: 70px;
     vertical-align: middle;
     margin: auto;
-    background-color: #fff;
     border-top: 2px solid #e1dddd;
 }
 
 .mx_MessageComposer_row {
     display: table-row;
     width: 100%;
-    height: 70px;
 }
 
 .mx_MessageComposer .mx_MessageComposer_avatar {
     display: table-cell;
     padding-left: 10px;
     padding-right: 28px;
-    height: 70px;
+    vertical-align: middle;
 }
 
 .mx_MessageComposer .mx_MessageComposer_avatar .mx_MemberAvatar {
     display: block;
-    margin-top: 18px;
 }
 
 .mx_MessageComposer_input {
@@ -49,17 +45,18 @@ limitations under the License.
 }
 
 .mx_MessageComposer_input textarea {
+    display: block;
     font-size: 15px;
     width: 100%;
-    height: 1.2em;
-    padding-top: 0.7em;
-    padding-bottom: 0.7em;
+    padding: 0px;
+    margin-top: 6px;
+    margin-bottom: 6px;
     border: 0px;
     resize: none;
     outline: none;
     -webkit-box-shadow: none;
     -moz-box-shadow: none;
-    box-shadow: none;    
+    box-shadow: none;
 
     /* needed for FF */
     font-family: 'Myriad Pro', Helvetica, Arial, Sans-Serif;