RDBC-307 Hook up node.js client to 4.2 server on travis

Author: gregolsky

.travis.yml

@@ -13,10 +13,13 @@ env:
       RAVENDB_TEST_HTTPS_SERVER_URL=https://localhost:8989
   matrix:
     - RAVENDB_SERVER_VERSION="4.1"
+      RAVENDB_BUILD_TYPE="stable"
+    - RAVENDB_SERVER_VERSION="4.2"
+      RAVENDB_BUILD_TYPE="nightly"
 before_install:
   - travis_retry sudo apt-get -qq update
   - travis_retry sudo apt-get install -y libunwind8 wget libicu52 libssl-dev curl unzip gettext libcurl4-openssl-dev zlib1g uuid-dev bzip2 openssl
-  - travis_retry wget -O RavenDB.tar.bz2 "https://hibernatingrhinos.com/downloads/RavenDB%20for%20Linux%20x64/latest?buildType=stable&version=$RAVENDB_SERVER_VERSION" 
+  - travis_retry wget -O RavenDB.tar.bz2 "https://hibernatingrhinos.com/downloads/RavenDB%20for%20Linux%20x64/latest?buildType=$RAVENDB_BUILD_TYPE&version=$RAVENDB_SERVER_VERSION" 
   - tar xjf RavenDB.tar.bz2
   - mkdir certs; pushd certs
   - openssl genrsa -out ca.key 2048