Rebase button in VS2013 does not have icon (#50)

Author: sboulema

TGit/Images.vsct

@@ -33,6 +33,8 @@
       <IDSymbol name="Fetch" value="18" />
       <IDSymbol name="BrowseRef" value="19" />
       <IDSymbol name="Tag" value="20" />
+      <IDSymbol name="AbortMerge" value="21" />
+      <IDSymbol name="Rebase" value="22" />
     </GuidSymbol>
   </Symbols>
 </CommandTable>

TGit/TGIT.vsct

@@ -493,7 +493,7 @@
     <Bitmaps>
       <Bitmap guid="guidImages" 
               href="Resources\octicons.png" 
-              usedList="showChanges, pull, push, showLog, revert, branch, merge, differences, blame, repo, resolve, sync, commit, disk, switch, cleanup, stash, fetch, browseRef, tag, abortMerge"/>     
+              usedList="showChanges, pull, push, showLog, revert, branch, merge, differences, blame, repo, resolve, sync, commit, disk, switch, cleanup, stash, fetch, browseRef, tag, abortMerge, rebase"/>     
     </Bitmaps>
   </Commands>