zeppelin git commit: [ZEPPELIN-2304] Fix vis Icon sizes in helium page (branch-0.7)

[ahyoungryu]

Repository: zeppelin
Updated Branches:
  refs/heads/branch-0.7 78804bb78 -> af9a689eb


[ZEPPELIN-2304] Fix vis Icon sizes in helium page (branch-0.7)

### What is this PR for?

Icon size of helium vis packages doesn't fit into the container button. I 
attached a image.

### What type of PR is it?
[Bug Fix]

### Todos

NONE

### What is the Jira issue?

[ZEPPELIN-2304](https://issues.apache.org/jira/browse/ZEPPELIN-2304)

### How should this be tested?

1. Install 2+ vis packages.
2. Open the `#helium` page

### Screenshots (if appropriate)

#### Before

<img width="378" alt="2304_before" 
src="https://cloud.githubusercontent.com/assets/4968473/24238569/17b7dbaa-0fee-11e7-9994-39fd7700c70c.png";>

#### After

<img width="389" alt="2304_after" 
src="https://cloud.githubusercontent.com/assets/4968473/24238572/1aac7b72-0fee-11e7-934d-da4c2d864b54.png";>

### Questions:
* Does the licenses files need update? - NO
* Is there breaking changes for older versions? - NO
* Does this needs documentation? - NO

Author: 1ambda <1am...@gmail.com>

Closes #2224 from 1ambda/ZEPPELIN-2304/fix-vis-icon-size-in-helium-page-for-072 
and squashes the following commits:

9853730 [1ambda] fix: Vis icon size in helium.html


Project: http://git-wip-us.apache.org/repos/asf/zeppelin/repo
Commit: http://git-wip-us.apache.org/repos/asf/zeppelin/commit/af9a689e
Tree: http://git-wip-us.apache.org/repos/asf/zeppelin/tree/af9a689e
Diff: http://git-wip-us.apache.org/repos/asf/zeppelin/diff/af9a689e

Branch: refs/heads/branch-0.7
Commit: af9a689eb611013670e29e5da6b6fc1e37a801cd
Parents: 78804bb
Author: 1ambda <1am...@gmail.com>
Authored: Wed Apr 5 16:38:41 2017 +0900
Committer: ahyoungryu <ahyoung...@apache.org>
Committed: Thu Apr 6 20:00:40 2017 +0900

----------------------------------------------------------------------
 zeppelin-web/src/app/helium/helium.css  | 6 ++++++
 zeppelin-web/src/app/helium/helium.html | 4 ++--
 2 files changed, 8 insertions(+), 2 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/zeppelin/blob/af9a689e/zeppelin-web/src/app/helium/helium.css
----------------------------------------------------------------------
diff --git a/zeppelin-web/src/app/helium/helium.css 
b/zeppelin-web/src/app/helium/helium.css
index 1d1a056..6040737 100644
--- a/zeppelin-web/src/app/helium/helium.css
+++ b/zeppelin-web/src/app/helium/helium.css
@@ -131,3 +131,9 @@
 .gray40-message a:focus {
   text-decoration: none;
 }
+
+.heliumVisIconButton > img {
+  display: block;
+  max-width: 100%;
+  height: auto;
+}

http://git-wip-us.apache.org/repos/asf/zeppelin/blob/af9a689e/zeppelin-web/src/app/helium/helium.html
----------------------------------------------------------------------
diff --git a/zeppelin-web/src/app/helium/helium.html 
b/zeppelin-web/src/app/helium/helium.html
index 16da087..39d20c4 100644
--- a/zeppelin-web/src/app/helium/helium.html
+++ b/zeppelin-web/src/app/helium/helium.html
@@ -38,10 +38,10 @@ limitations under the License.
              data-ng-model="visualizationOrder">
           <div class="btn-group" data-ng-repeat="pkgName in visualizationOrder"
                as-sortable-item>
-            <div class="btn btn-default btn-sm"
+            <button class="btn btn-default btn-sm heliumVisIconButton"
                  ng-bind-html='defaultVersions[pkgName].pkg.icon'
                  as-sortable-item-handle>
-            </div>
+            </button>
           </div>
         </div>
         <div class="saveLink"