[longomatch] Don't serialize TagsByGroups

[Andoni Morales Alastruey <amorales src gnome org>]

commit 9f192bd0f2ad8a0fdaff7e4503859c2aa94faf4c
Author: Andoni Morales Alastruey <ylatuya gmail com>
Date:   Thu Oct 9 18:05:11 2014 +0200

    Don't serialize TagsByGroups

 LongoMatch.Core/Store/EventType.cs |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/LongoMatch.Core/Store/EventType.cs b/LongoMatch.Core/Store/EventType.cs
index c838912..14ef1c5 100644
--- a/LongoMatch.Core/Store/EventType.cs
+++ b/LongoMatch.Core/Store/EventType.cs
@@ -121,6 +121,7 @@ namespace LongoMatch.Core.Store
                        set;
                }
 
+               [JsonIgnore]
                public Dictionary<string, List<Tag>> TagsByGroup {
                        get {
                                return Tags.GroupBy (t => t.Group).ToDictionary (g => g.Key, g => g.ToList());