updated nuget to support restoring via solution file and added the restore into the build scripts.

.travis.yml

@@ -19,8 +19,9 @@ before_install:
 - sudo installer -pkg "MonoFramework-MDK-${MONO_VERSION}.macos10.xamarin.x86.pkg" -target /
 
 script:
+- mono --runtime=v4.0.30319 ./Tools/NuGet/nuget.exe restore ./src/CSharpDriver-Mono.sln
 - xbuild ./src/CSharpDriver-Mono.sln
 - brew install mongodb
 - mkdir -p ./build/db/data
 - mongod --dbpath ./build/db/data --logpath ./build/db/log.log --fork --setParameter enableTestCommands=1
-- mono --runtime=v4.0.30319 ./Tools/NUnit/nunit-console.exe ./src/MongoDB.Bson.Tests/bin/Debug/MongoDB.Bson.Tests.dll ./src/MongoDB.Driver.Tests/bin/Debug/MongoDB.Driver.Core.Tests.dll ./src/MongoDB.Driver.Tests/bin/Debug/MongoDB.Driver.Tests.dll
+- mono --runtime=v4.0.30319 ./Tools/NUnit/nunit-console.exe ./src/MongoDB.Bson.Tests/bin/Debug/MongoDB.Bson.Tests.dll ./src/MongoDB.Driver.Core.Tests/bin/Debug/MongoDB.Driver.Core.Tests.dll ./src/MongoDB.Driver.Tests/bin/Debug/MongoDB.Driver.Tests.dll

build/build.ps1

@@ -1,4 +1,4 @@
-Properties {
+properties {
     if(-not (Test-Path variable:base_version)) {
         $base_version = "2.0.0"
     }
@@ -112,6 +112,8 @@ Task Build -Depends Clean, OutputVersion {
             -config $config `
             -sem_version $sem_version `
 
+        Exec { &$nuget_tool restore $sln_file }
+
         mkdir -path $45_bin_dir | out-null
         Write-Host "Building $sln_file for .NET 4.5" -ForegroundColor Green
         Exec { msbuild "$sln_file" /t:Rebuild /p:Configuration=$config /p:TargetFrameworkVersion=v4.5 /v:quiet /p:OutDir=$45_bin_dir }