Ignoring generated contents for the p2updatesite

Change-Id: I5917a1a0fd74ec43d5e798752763c1869fbefeaf

.gitignore

diff --git a/.gitignore b/.gitignore
index 117330a..28b45fe 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,6 @@
 .DS_Store
 /.metadata
 /.recommenders
+p2updatesite/*.jar
+p2updatesite/features
+p2updatesite/plugins