Hide output of dotnet restore by default

Address Andy's comments about build script.
Add more information about the version into build
Use windows inbox version of pester for FullCLR
Revert dotnet cli to a known good version to avoid #638

.travis.yml

@@ -13,7 +13,7 @@ before_install:
   - sudo sh -c 'echo "deb [arch=amd64] http://apt-mo.trafficmanager.net/repos/dotnet/ trusty main" > /etc/apt/sources.list.d/dotnetdev.list'
   - sudo apt-key adv --keyserver apt-mo.trafficmanager.net --recv-keys 417A0893
   - sudo apt-get -qq update
-  - sudo apt-get install -y dotnet=1.0.0.001638-1
+  - sudo apt-get install -y dotnet=1.0.0.001425-1
 script:
   - dotnet restore
   - ./build.sh