Added CSS to wrap ref names correctly

Bug: Issue 112
Change-Id: I9fd2ac14082f327f34079bc1b809b61fb3e19912

resources/com/google/gitiles/static/base.css

diff --git a/resources/com/google/gitiles/static/base.css b/resources/com/google/gitiles/static/base.css
index 9719920..a1d5a36 100644
--- a/resources/com/google/gitiles/static/base.css
+++ b/resources/com/google/gitiles/static/base.css
@@ -296,7 +296,9 @@
 .RefList-title {
   margin: 0;
 }
-.RefList-items {}
+.RefList-items {
+  word-wrap: break-word;
+}
 .RefList-item {
   padding: 2px 0;
 }