Do not require .dll for publish command

Author: ethanhann

docs-src/commands.md

@@ -235,7 +235,7 @@ InEngine 3.x
 Copyright © 2017 Ethan Hann
 
   --command-plugin    Required. The name of a command plugin file, e.g. 
-                      InEngine.Core.dll
+                      InEngine.Core
 
   --command-verb      A plugin command verb, e.g. echo
 

docs-src/index.md

@@ -39,7 +39,7 @@ Want to queue our example echo command to run in the background or possibly on a
 Use the core plugin's **queue:publish** command:
 
 ```bash
-inengine.exe -pInEngine.Core queue:publish --command-plugin=InEngine.Core.dll --command-verb=echo --args "text=Hello, world"
+inengine.exe -pInEngine.Core queue:publish --command-plugin=InEngine.Core --command-verb=echo --args "text=Hello, world"
 ``` 
 
 How do we consume that queued echo command?

docs-src/queuing.md

@@ -158,19 +158,19 @@ Note that all queue commands reside in the **InEngine.Core** plugin.
 This is an example of how to publish a command from the CLI by specifying the command's plugin, class name, and arguments:
 
 ```bash
-inengine.exe -pInEngine.Core queue:publish --command-plugin=MyCommandPlugin.dll --command-class=MyCommand --args "text=bar"
+inengine.exe -pInEngine.Core queue:publish --command-plugin=MyCommandPlugin --command-class=MyCommand --args "text=bar"
 ```
 
 There is an "Echo" command in the *InEngine.Core* package. It is useful for end-to-end testing with the queue feature.
 
 ```bash
-inengine.exe -pInEngine.Core queue:publish --command-plugin=InEngine.Core.dll --command-class=InEngine.Core.Commands.Echo --args "text=foo"
+inengine.exe -pInEngine.Core queue:publish --command-plugin=InEngine.Core --command-class=InEngine.Core.Commands.Echo --args "text=foo"
 ```
 
 The command verb can also be specified instead of the full class name:
 
 ```bash
-inengine.exe -pInEngine.Core queue:publish --command-plugin=InEngine.Core.dll --command-verb=echo--args "text=foo"
+inengine.exe -pInEngine.Core queue:publish --command-plugin=InEngine.Core --command-verb=echo--args "text=foo"
 ```
 
 ## Consuming Commands

src/InEngine.Core/Queuing/Commands/Publish.cs

@@ -7,7 +7,7 @@ namespace InEngine.Core.Queuing.Commands
 {
     public class Publish : AbstractCommand
     {
-        [Option("command-plugin", Required = true, HelpText = "The name of a command plugin file, e.g. InEngine.Core.dll")]
+        [Option("command-plugin", Required = true, HelpText = "The name of a command plugin file, e.g. InEngine.Core")]
         public string CommandPlugin { get; set; }
 
         [Option("command-verb", HelpText =  "A plugin command verb, e.g. echo.")]
@@ -30,7 +30,7 @@ public override void Run()
             var command = Command;
 
             if (command == null && !string.IsNullOrWhiteSpace(CommandPlugin)) {
-                var plugin = PluginAssembly.LoadFrom(CommandPlugin);
+                var plugin = PluginAssembly.LoadFrom($"{CommandPlugin}.dll");
                 if (!string.IsNullOrWhiteSpace(CommandClass))
                     command = plugin.CreateCommandFromClass(CommandClass);
                 else if (!string.IsNullOrWhiteSpace(CommandVerb)) {

src/InEngine/appsettings.json

@@ -1,6 +1,7 @@
 {
   "InEngine": {
     "Plugins": [
+      
     ],
     "Mail": {
       "Host": "localhost",