Add filter to coverage viewer. Clear coverage properly from cache

package.json

@@ -108,7 +108,7 @@
         "c9.ide.save": "#e00549cb0f",
         "c9.ide.scm": "#2398826541",
         "c9.ide.terminal.monitor": "#b76f1c9f24",
-        "c9.ide.test": "#d48181f8f6",
+        "c9.ide.test": "#d55b1ee350",
         "c9.ide.test.mocha": "#88fee23065",
         "c9.ide.theme.flat": "#2de8414db7",
         "c9.ide.threewaymerge": "#229382aa0b",

plugins/c9.ide.layout.classic/themes/default-flat-light.less

@@ -1226,7 +1226,7 @@
 @dropdown-black-image-height: 5px;
 @dropdown-black-background-position: 50% 50%;
 @dropdown-black-height: 28px;
-@dropdown-black-padding: 8px 0 5px 9px;
+@dropdown-black-padding: 7px 8px 5px 9px;
 @dropdown-black-font-family: @general-font-family;
 @dropdown-black-font-size: 13px;
 @dropdown-black-button-width: 24px;