Add support for post 2013 docx and xlsx in Report [CUSTOM]

Fix tryton#8

Author: romainseon

trytond/report/report.py

@@ -63,6 +63,7 @@
     'doc95': 'doc',
     'docbook': 'xml',
     'docx7': 'docx',
+    'docx': 'docx',
     'ooxml': 'xml',
     'latex': 'ltx',
     'sdc4': 'sdc',
@@ -77,6 +78,7 @@
     'xhtml': 'html',
     'xls5': 'xls',
     'xls95': 'xls',
+    'xlsx': 'xlsx',
     }
 
 TIMEDELTA_DEFAULT_CONVERTER = {