Add a test for whitespace inside the template.

This is similar to the surrounding whitespace test but for whitespace inside of a tag as opposed to before/after the first element of the template.

js/test_cases/internal_whitespace/README.md

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+Through experimentation I have determined that DustJS:
+
+- Ignores newlines entirely (probably why there is a special character for newlines)
+- Ignores spaces on empty lines
+- Ignore tabs on empty lines
+- Honors interior tabs
+- Honors interior spaces
+- Honors trailing spaces on opening, body, and closing tags
+- Honors trailing spaces on tagless lines with content
+- Honors trailing tabs on opening, body, and closing tags
+- Honors trailing tabs on tagless lines with content
+- Ignores leading spaces on opening, body, and closing tags
+- Ignores leading spaces on tagless lines with content
+- Ignores leading tabs on opening, body, and closing tags
+- Ignores leading tabs on tagless lines with content
+
+Definitions
+-----------
+
+Interior: Surounnded by tags on the same line:
+```
+{foo}this is interior{/foo}
+```
+
+Trailing: On a line with a tag but no tag following it on that line:
+```
+{stuff}
+{name}this is trailing
+{other stuff}
+```
+
+Leading: On a line with a tag but no tag preceding it on that line:
+```
+{stuff}
+this is leading{name}
+{other stuff}
+```

js/test_cases/internal_whitespace/input1.json

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+{"names": ["Alice", "Bob", "Chris"]}

js/test_cases/internal_whitespace/main.dust

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+- simple -{~n}
+{#names}{.}{/names}
+{~n}- new lines -{~n}
+{#names}
+{.}
+{/names}
+
+{~n}- interior tabs -{~n}
+{#names}	{.}	{/names}
+
+{~n}- interior spaces -{~n}
+{#names} {.} {/names}
+
+{~n}- empty line with spaces -{~n}
+{#names}
+  
+{/names}
+
+{~n}- empty line with tabs -{~n}
+{#names}
+	
+{/names}
+
+{~n}- empty line with spaces, trailing spaces on opening and closing -{~n}
+{#names} 
+  
+{/names}    
+
+{~n}- no line, trailing spaces on opening and closing -{~n}
+{#names} 
+{/names}    
+
+{~n}- empty line, trailing spaces on opening and closing -{~n}
+{#names} 
+
+{/names}    
+
+{~n}- trailing spaces -{~n}
+{#names} 
+{.}  
+{/names}    
+
+{~n}- tagless line trailing spaces -{~n}
+{#names}
+    
+{/names}
+{#names}
+line with content but no tag      
+{/names}
+
+{~n}- empty line with tabs, trailing tabs on opening and closing -{~n}
+{#names}	
+		
+{/names}				
+
+{~n}- no line, trailing tabs on opening and closing -{~n}
+{#names}			
+{/names}				
+
+{~n}- empty line, trailing tabs on opening and closing -{~n}
+{#names}	
+
+{/names}				
+
+{~n}- trailing tabs -{~n}
+{#names}	
+{.}		
+{/names}				
+
+{~n}- tagless line trailing tabs -{~n}
+{#names}
+				
+{/names}
+{#names}
+line with content but no tag						
+{/names}
+
+
+
+
+
+
+
+
+
+{~n}- empty line with spaces, leading spaces on opening and closing -{~n}
+ {#names}
+  
+    {/names}
+
+{~n}- no line, leading spaces on opening and closing -{~n}
+ {#names}
+    {/names}
+
+{~n}- empty line, leading spaces on opening and closing -{~n}
+ {#names}
+
+    {/names}
+
+{~n}- leading spaces -{~n}
+ {#names}
+  {.}
+    {/names}
+
+{~n}- tagless line leading spaces -{~n}
+{#names}
+    
+{/names}
+{#names}
+      line with content but no tag
+{/names}
+
+{~n}- empty line with tabs, leading tabs on opening and closing -{~n}
+	{#names}
+		
+				{/names}
+
+{~n}- no line, leading tabs on opening and closing -{~n}
+			{#names}
+				{/names}
+
+{~n}- empty line, leading tabs on opening and closing -{~n}
+	{#names}
+
+				{/names}
+
+{~n}- leading tabs -{~n}
+	{#names}
+		{.}
+				{/names}
+
+{~n}- tagless line leading tabs -{~n}
+{#names}
+				
+{/names}
+{#names}
+						line with content but no tag
+{/names}