CSHARP-1191: Move GridFSExceptions to MongoDB.Driver.GridFS namespace.

Author: rstam

src/MongoDB.Driver.GridFS/GridFSChunkException.cs

@@ -18,7 +18,7 @@
 using MongoDB.Bson;
 using MongoDB.Driver.Core.Misc;
 
-namespace MongoDB.Driver
+namespace MongoDB.Driver.GridFS
 {
     /// <summary>
     /// Represents a GridFSChunk exception.

src/MongoDB.Driver.GridFS/GridFSException.cs

@@ -16,7 +16,7 @@
 using System;
 using System.Runtime.Serialization;
 
-namespace MongoDB.Driver
+namespace MongoDB.Driver.GridFS
 {
     /// <summary>
     /// Represents a GridFS exception.

src/MongoDB.Driver.GridFS/GridFSFileNotFoundException.cs

@@ -18,7 +18,7 @@
 using MongoDB.Bson;
 using MongoDB.Driver.Core.Misc;
 
-namespace MongoDB.Driver
+namespace MongoDB.Driver.GridFS
 {
     /// <summary>
     /// Represents a GridFSFileNotFound exception.

src/MongoDB.Driver.GridFS/GridFSMD5Exception.cs

@@ -18,7 +18,7 @@
 using MongoDB.Bson;
 using MongoDB.Driver.Core.Misc;
 
-namespace MongoDB.Driver
+namespace MongoDB.Driver.GridFS
 {
     /// <summary>
     /// Represents a GridFSMD5 exception.