Clean unused references
diff --git a/src/Lucene.Net.Core/Lucene.Net.csproj b/src/Lucene.Net.Core/Lucene.Net.csproj
index d52e4b0..62ba04c 100644
--- a/src/Lucene.Net.Core/Lucene.Net.csproj
+++ b/src/Lucene.Net.Core/Lucene.Net.csproj
@@ -39,9 +39,6 @@
   <ItemGroup>
     <Reference Include="Microsoft.CSharp" />
     <Reference Include="System" />
-    <Reference Include="System.Collections.Immutable">
-      <HintPath>..\..\packages\Microsoft.Bcl.Immutable.1.0.34\lib\portable-net45+win8+wp8+wpa81\System.Collections.Immutable.dll</HintPath>
-    </Reference>
     <Reference Include="System.configuration" />
     <Reference Include="System.Core" />
     <Reference Include="System.Data" />
diff --git a/src/Lucene.Net.Core/packages.config b/src/Lucene.Net.Core/packages.config
index 40ec27e..6b8deb9 100644
--- a/src/Lucene.Net.Core/packages.config
+++ b/src/Lucene.Net.Core/packages.config
@@ -1,5 +1,3 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="Microsoft.Bcl.Immutable" version="1.0.34" targetFramework="net451" />
-  <package id="SharpZipLib" version="0.86.0" targetFramework="net40-Client" />
 </packages>
\ No newline at end of file
diff --git a/src/Lucene.Net.TestFramework/packages.config b/src/Lucene.Net.TestFramework/packages.config
index 7a698ab..967502d 100644
--- a/src/Lucene.Net.TestFramework/packages.config
+++ b/src/Lucene.Net.TestFramework/packages.config
@@ -1,5 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="NUnit" version="2.6.3" targetFramework="net40" />
-  <package id="SharpZipLib" version="0.86.0" targetFramework="net40" />
 </packages>
\ No newline at end of file
diff --git a/src/Lucene.Net.Tests/packages.config b/src/Lucene.Net.Tests/packages.config
index 7a698ab..967502d 100644
--- a/src/Lucene.Net.Tests/packages.config
+++ b/src/Lucene.Net.Tests/packages.config
@@ -1,5 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="NUnit" version="2.6.3" targetFramework="net40" />
-  <package id="SharpZipLib" version="0.86.0" targetFramework="net40" />
 </packages>
\ No newline at end of file