Update MD014/commands-show-output to report each violation, include fix information (fixes #217).

test/code_block_dollar.md

@@ -1,9 +1,9 @@
 The following code block shouldn't have $ before the commands:
 
     $ ls {MD014}
-    $ less foo
+    $ less foo {MD014}
 
-    $ cat bar
+    $ cat bar {MD014}
 
 However the following code block shows output, and $ can be used to
 distinguish between command and output:
@@ -31,3 +31,19 @@ shouldn't fire: {MD046:32}
 
 ```bash
 ```
+
+Mixed content:
+
+    $ ls
+    file.md other.md
+    $ git branch {MD014}
+    $ cat stuff {MD014}
+
+    output
+    $ ls {MD014}
+    $ git branch {MD014}
+    $ cat stuff
+    stuff here
+    more stuff
+    $ tail cat
+    meow

test/code_block_dollar_fence.md

@@ -1,36 +1,43 @@
 # heading
 
 ```fence
-$ code
-```
-
-text
-
-```fence
-$ code
-```
-
-text
-
-```fence
-$ code
-$ code
+$ code {MD014}
+```
+
+text
+
+```fence
+$ code {MD014}
+```
+
+text
+
+```fence
+$ code {MD014}
+$ code {MD014}
+```
+
+text
+
+```fence
+$ code {MD014}
+$ code {MD014}
 ```
 
 text
 
 ```fence
 $ code
+code
 $ code
+code
 ```
 
 text
 
 ```sh
 
-$ npm install --save multimatch
+$ npm install --save multimatch {MD014}
 ```
 
 text
-
-{MD014:3} {MD014:9} {MD014:15} {MD014:22} {MD014:29}

test/detailed-results-MD011-MD021.md.fixed

@@ -8,7 +8,7 @@ A [reversed](link) example.
 
 ## 123456789 123456789 123456789 123456789 123456789 123456789
 
-    $ command with no output
+    command with no output
 
 ## No space A