travis widget & script fix

Author: kelvich

.travis.yml

@@ -5,5 +5,5 @@ os:
 compiler:
   - gcc
   - clang
-script: ./configure && make check
+script: ./configure && make -j 4 && make check
 

README.md

@@ -1,5 +1,7 @@
 # Postgres_cluster
 
+[![Build Status](https://travis-ci.org/postgrespro/postgres_cluster.svg?branch=master)](https://travis-ci.org/postgrespro/postgres_cluster)
+
 Various experiments with PostgreSQL clustering perfomed at PostgresPro.
 
 This is mirror of postgres repo with several changes to the core and few extra extensions.