Fixed issues with the Python3.4 grammar file.

The order of symbols matters. 'file_input' needs to be the first symbol.

jedi/parser/grammar3.4.txt

@@ -15,8 +15,8 @@
 #       file_input is a module or sequence of commands read from an input file;
 #       eval_input is the input for the eval() functions.
 # NB: compound_stmt in single_input is followed by extra NEWLINE!
-single_input: NEWLINE | simple_stmt | compound_stmt NEWLINE
 file_input: (NEWLINE | stmt)* ENDMARKER
+single_input: NEWLINE | simple_stmt | compound_stmt NEWLINE
 eval_input: testlist NEWLINE* ENDMARKER
 
 decorator: '@' dotted_name [ '(' [arglist] ')' ] NEWLINE