Merge PR #247, Update Nuget package for v1.0-rc1

* Remove Directory.build.props
* Move Nuget settings to .csproj and update versions
* Fix repository URL, license URL and update copyright year.

Author: piksel

src/Directory.build.props

@@ -2,13 +2,27 @@
 
   <PropertyGroup>
     <TargetFrameworks>netstandard2;net45</TargetFrameworks>
-    <PackageId>SharpZipLib </PackageId>
     <SignAssembly>True</SignAssembly>
     <AssemblyOriginatorKeyFile>ICSharpCode.SharpZipLib.snk</AssemblyOriginatorKeyFile>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
-    <Version>1.0.0-alpha2</Version>
+  </PropertyGroup>
+  
+  <!-- Nuget specific tags -->
+  <PropertyGroup>
+    <AssemblyVersion>1.0.0.3</AssemblyVersion>
+    <FileVersion>1.0.0.3</FileVersion>
+    <Version>1.0.0-rc1</Version>
+    <PackageId>SharpZipLib </PackageId>
+    <Company>ICSharpCode</Company>
+    <Authors>ICSharpCode</Authors>
+    <Description>SharpZipLib (#ziplib, formerly NZipLib) is a compression library for Zip, GZip, BZip2, and Tar written entirely in C# for .NET. It is implemented as an assembly (installable in the GAC), and thus can easily be incorporated into other projects (in any .NET language)</Description>
+    <PackageLicenseUrl>https://github.com/icsharpcode/SharpZipLib/raw/master/LICENSE.txt</PackageLicenseUrl>
+    <PackageProjectUrl>http://icsharpcode.github.io/SharpZipLib/</PackageProjectUrl>
     <RepositoryUrl>https://github.com/icsharpcode/SharpZipLib</RepositoryUrl>
-    <PackageReleaseNotes>This is a pre-release version!
+    <Copyright>Copyright © 2000-2018 SharpZipLib Contributors</Copyright>
+    <PackageTags>Compression Library Zip GZip BZip2 LZW Tar</PackageTags>
+    <NeutralLanguage>en-US</NeutralLanguage>
+    <PackageReleaseNotes>This is a release candidate for v1.0
 
 Please see https://github.com/icsharpcode/SharpZipLib/wiki/Release-1.0 for more information.</PackageReleaseNotes>
     <PackageLicenseUrl>https://github.com/icsharpcode/SharpZipLib/blob/master/LICENSE.txt</PackageLicenseUrl>