make jenkins and travis use a common script

jenkins.sh

@@ -1,25 +1,3 @@
-#! /bin/bash
+#!/bin/sh
 
-set -ex
-
-virtualenv env
-. env/bin/activate
-pip install -r scripts/requirements.txt
-
-# do sanity checks on the examples and swagger
-(cd event-schemas/ && ./check_examples.py)
-(cd api && ./check_examples.py)
-(cd api && npm install && node validator.js -s "client-server")
-
-: ${GOPATH:=${WORKSPACE}/.gopath}
-mkdir -p "${GOPATH}"
-export GOPATH
-go get github.com/hashicorp/golang-lru
-go get gopkg.in/fsnotify.v1
-
-# make sure that the scripts build
-(cd scripts/continuserv && go build)
-(cd scripts/speculator && go build)
-
-# build the spec and collect the supporting docs for matrix.org
-./scripts/generate-matrix-org-assets
+exec ./scripts/test-and-build.sh