Restore compatibility with Sublime Text 2

Static methods of the CSVMatrix class were missing the @staticmethod decorator.

Author: wadetb

csvplugin.py

@@ -67,6 +67,7 @@ def Finalize(self):
 
         self.valid = True
 
+    @staticmethod
     def GetCellValue(row, column_index):
         try:
             return row[column_index]
@@ -273,6 +274,7 @@ def ParseRow(self, row):
 
         return columns
 
+    @staticmethod
     def FromText(text):
         matrix = CSVMatrix()
 
@@ -285,6 +287,7 @@ def FromText(text):
 
         return matrix
 
+    @staticmethod
     def FromView(view):
         text = view.substr(sublime.Region(0, view.size()))