Increase .travis.yml consistency between repos

- aspnet/Universe#349
- minimize `dotnet` setup time; no need for caching
- install packages used in other repos; explicit and avoids issues as (Beta) Trusty image changes
- just need one `brew install` command

.travis.yml

@@ -4,11 +4,16 @@ dist: trusty
 addons:
   apt:
     packages:
+    - gettext
+    - libcurl4-openssl-dev
+    - libicu-dev
+    - libssl-dev
     - libunwind8
-before_install:
-  - if test "$TRAVIS_OS_NAME" == "osx"; then brew update; brew install nginx; brew install openssl; ln -s /usr/local/opt/openssl/lib/libcrypto.1.0.0.dylib /usr/local/lib/; ln -s /usr/local/opt/openssl/lib/libssl.1.0.0.dylib /usr/local/lib/; else ./install-nginx.sh; fi
-install:
-  - export PATH="$PATH:$HOME/nginxinstall/sbin/"
+    - zlib1g
+env:
+  global:
+    - DOTNET_SKIP_FIRST_TIME_EXPERIENCE: true
+    - DOTNET_CLI_TELEMETRY_OPTOUT: 1
 mono:
   - 4.0.5
 os:
@@ -21,6 +26,9 @@ branches:
     - release
     - dev
     - /^(.*\/)?ci-.*$/
+before_install:
+  - if test "$TRAVIS_OS_NAME" == "osx"; then brew update; brew install openssl nginx; ln -s /usr/local/opt/openssl/lib/libcrypto.1.0.0.dylib /usr/local/lib/; ln -s /usr/local/opt/openssl/lib/libssl.1.0.0.dylib /usr/local/lib/; else ./install-nginx.sh; fi
+install:
+  - export PATH="$PATH:$HOME/nginxinstall/sbin/"
 script:
   - ./build.sh --quiet verify
-