License / Documentation cleanup (DataDog#357)

- Edit whitespace on LICENSE so hopefully GitHub will auto-recognize the license as Apache 2.0
- Change all instances of "dd-trace-csharp" to "dd-trace-dotnet"
- For NuGet packages, change PackageLicenseUrl (which is being deprecated) to License and correctly specify Apache-2.0
- Fix instructions for doing a Windows command line build

Author: zacharycmontoya

Diff for: LICENSE

@@ -1,3 +1,4 @@
+
                                  Apache License
                            Version 2.0, January 2004
                         http://www.apache.org/licenses/
@@ -198,4 +199,4 @@
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
-   limitations under the License.
+   limitations under the License.

Diff for: NOTICE

@@ -1,4 +1,4 @@
-Datadog .NET Tracer for APM (dd-trace-csharp)
+Datadog .NET Tracer for APM (dd-trace-dotnet)
 Copyright 2018 Datadog, Inc.
 
 This product includes software developed at Datadog (https://www.datadoghq.com/).

Diff for: README.md

@@ -43,6 +43,7 @@ Linux integration tests        | [![Build Status](https://dev.azure.com/datadog-
   - Individual components
     - .NET Framework 4.7 targeting pack
 - [.NET Core 2.1 SDK](https://dotnet.microsoft.com/download/dotnet-core/2.1)
+- Optional: [nuget.exe CLI](https://www.nuget.org/downloads) v3.4.4 or newer
 - Optional: [WiX Toolset 3.11.1](http://wixtoolset.org/releases/) or newer to build Windows installer (msi)
   - Requires .NET Framework 3.5 SP2 (install from Windows Features control panel: `OptionalFeatures.exe`)
   - [WiX Toolset VS2017 Extension](https://marketplace.visualstudio.com/items?itemName=RobMensching.WixToolsetVisualStudio2017Extension) to build installer from VS2017
@@ -57,15 +58,17 @@ From a _Developer Command Prompt for VS 2017_:
 
 ```cmd
 rem Restore NuGet packages
-dotnet restore Datadog.Trace.sln
+rem nuget.exe is required for command line restore because msbuild doesn't support packages.config
+rem (see https://github.com/NuGet/Home/issues/7386)
+nuget restore Datadog.Trace.sln
 
 rem Build C# projects (Platform: always AnyCPU)
 msbuild Datadog.Trace.proj /t:BuildCsharp /p:Configuration=Release;Platform=AnyCPU
 
 rem Build NuGet packages
-dotnet pack src/Datadog.Trace/Datadog.Trace.csproj
-dotnet pack src/Datadog.Trace.OpenTracing/Datadog.Trace.OpenTracing.csproj
-dotnet pack src/Datadog.Trace.ClrProfiler.Managed/Datadog.Trace.ClrProfiler.Managed.csproj
+dotnet pack src\Datadog.Trace\Datadog.Trace.csproj
+dotnet pack src\Datadog.Trace.OpenTracing\Datadog.Trace.OpenTracing.csproj
+dotnet pack src\Datadog.Trace.ClrProfiler.Managed\Datadog.Trace.ClrProfiler.Managed.csproj
 
 rem Build C++ projects (Platform: x64 or x86)
 msbuild Datadog.Trace.proj /t:BuildCpp /p:Configuration=Release;Platform=x64

Diff for: deploy/Datadog.Trace.ClrProfiler.WindowsInstaller/build.ps1

@@ -13,7 +13,7 @@ Start-Process -NoNewWindow -Wait -FilePath "${Env:ProgramFiles(x86)}\WiX Toolset
 $args = @(
     ".\output\Product.wixobj",
     ".\output\WixUI_InstallDir_Custom.wixobj",
-    "-out", "output\dd-trace-csharp.msi",
+    "-out", "output\dd-trace-dotnet.msi",
     "-ext", "WixUIExtension"
 )
 

Diff for: src/Directory.Build.props

@@ -8,7 +8,7 @@
     <IsPackable>true</IsPackable>
     <PackageIconUrl>https://github.com/DataDog/dd-trace-dotnet/raw/master/datadog-logo-64x64.png</PackageIconUrl>
     <PackageProjectUrl>https://docs.datadoghq.com/tracing/setup/dotnet/</PackageProjectUrl>
-    <PackageLicenseUrl>https://github.com/DataDog/dd-trace-dotnet/blob/master/LICENSE</PackageLicenseUrl>
+    <PackageLicenseExpression>Apache-2.0</PackageLicenseExpression>
     <PackageRequireLicenseAcceptance>false</PackageRequireLicenseAcceptance>
     <PackageReleaseNotes>See release notes at https://github.com/DataDog/dd-trace-dotnet/releases</PackageReleaseNotes>
     <PackageTags>Datadog;APM;tracing;profiling;instrumentation</PackageTags>