Add tests, some rule fixes (#3)

* Add initial tests, some grammar fixes

* Mark generated files as binary

.gitattributes

@@ -0,0 +1,3 @@
+*.c binary
+src/node-types.json binary
+src/grammar.json binary

corpus/commands.txt

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+===
+Plain cmdlet
+===
+
+Write-Something
+
+---
+
+(program
+  (pipeline_statement
+    (command_expression
+      (bareword_string))))
+
+===
+Native command
+===
+
+net.exe
+
+---
+
+(program
+  (pipeline_statement
+    (command_expression
+      (bareword_string))))
+
+===
+Cmdlet with arguments
+===
+
+Write-Output 'Hi'
+
+---
+
+(program
+  (pipeline_statement
+    (command_expression
+      (bareword_string)
+      (command_argument
+        (single_quote_string)))))
+
+===
+Cmdlet with parameters
+===
+
+Write-Output -InputObject 'Hi'
+
+---
+
+(program
+  (pipeline_statement
+    (command_expression
+      (bareword_string)
+      (command_parameter)
+      (command_argument
+        (single_quote_string)))))
+
+===
+Cmdlet with multiple arguments and parameters
+===
+
+Invoke-Thing $argument1 -Parameter 'Thing'
+
+---
+
+(program
+  (pipeline_statement
+    (command_expression
+      (bareword_string)
+      (command_argument
+        (variable
+          (simple_variable)))
+      (command_parameter)
+      (command_argument
+        (single_quote_string)))))
+
+===
+Unix-like native command
+===
+
+git clone -b this_branch --single-branch https://github.com/PowerShell/PowerShell
+
+---
+
+(program
+  (pipeline_statement
+    (command_expression
+      (bareword_string)
+      (command_argument
+        (bareword_string))
+      (command_parameter)
+      (command_argument
+        (bareword_string))
+      (command_parameter)
+      (command_argument
+        (bareword_string)))))
+
+===
+Windows-style native command
+===
+
+net use e: \\usrsvr002\smithmark Ue345Ii /user:pdc01\msmith2 /savecred /p:yes
+
+---
+
+(program
+  (pipeline_statement
+    (command_expression
+      (bareword_string)
+      (command_argument
+        (bareword_string))
+      (command_argument
+        (bareword_string))
+      (command_argument
+        (bareword_string))
+      (command_argument
+        (bareword_string))
+      (command_argument
+        (bareword_string))
+      (command_argument
+        (bareword_string))
+      (command_argument
+        (bareword_string)))))

corpus/comments.txt

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+===
+Single inline commant
+===
+
+$x = 3
+
+# This is a comment
+
+Get-ChildItem .
+
+---
+
+(program
+  (assignment_statement
+    (variable
+      (simple_variable))
+    (pipeline_statement
+      (number_expr)))
+  (comment)
+  (pipeline_statement
+    (command_expression
+      (bareword_string)
+      (command_argument
+        (bareword_string)))))
+
+===
+Single line block comment
+===
+
+$x = 3
+
+<# Block comment #>
+
+Get-ChildItem .
+
+---
+
+(program
+  (assignment_statement
+    (variable
+      (simple_variable))
+    (pipeline_statement
+      (number_expr)))
+  (comment)
+  (pipeline_statement
+    (command_expression
+      (bareword_string)
+      (command_argument
+        (bareword_string)))))
+
+===
+Multi-line block comment
+===
+
+$x = 3
+
+<#
+
+Here
+
+is a 
+
+longer
+
+comment           #>
+
+Get-ChildItem .
+
+---
+
+(program
+  (assignment_statement
+    (variable
+      (simple_variable))
+    (pipeline_statement
+      (number_expr)))
+  (comment)
+  (pipeline_statement
+    (command_expression
+      (bareword_string)
+      (command_argument
+        (bareword_string)))))
+
+===
+Pathological block comment #1
+===
+
+<##>
+
+---
+
+(program
+  (comment))
+
+===
+Pathological block comment #2
+===
+
+<###>
+
+---
+
+(program
+  (comment))