Updated README.md to show all services.

Update pkg/build/images.go to use the latest version of CouchDB if
`couchdb` was set to `services`.

README.md

@@ -152,17 +152,30 @@ Drone can launch database containers for your build:
 services:
   - cassandra
   - couchdb
+  - couchdb:1.0
+  - couchdb:1.4
+  - couchdb:1.5
   - elasticsearch
+  - elasticsearch:0.20
+  - elasticsearch:0.90
   - neo4j
+  - neo4j:1.9
   - mongodb
+  - mongodb:2.2
+  - mongodb:2.4
   - mysql
+  - mysql:5.5
   - postgres
+  - postgres:9.1
   - rabbitmq
+  - rabbitmq:3.2
   - redis
   - riak
   - zookeeper
 ```
 
+If you omit the version, Drone will launch the latest version of the database. (For example, if you set `mongodb`, Drone wil launch MongoDB 2.4.)
+
 **NOTE:** database and service containers are exposed over TCP connections and
 have their own local IP address. If the **socat** utility is installed inside your
 Docker image, Drone will automatically proxy localhost connections to the correct

pkg/build/images.go

@@ -116,7 +116,7 @@ var services = map[string]*image{
 	// couchdb
 	"couchdb": {
 		Ports: []string{"5984"},
-		Tag:   "bradrydzewski/couchdb:1.0",
+		Tag:   "bradrydzewski/couchdb:1.5",
 		Name:  "couchdb",
 	},
 	"couchdb:1.0": {