Partch for #55 (missing dependency hr-timesheet)

Also fixed bug on loading of 'account_analytic_analysis_recurring'
module and pylint fixes in project_sla.m2m

contract/__openerp__.py

@@ -44,7 +44,7 @@ Backport done By Yannick Buron.
         'account_analytic_analysis_recurring_cron.xml',
         'account_analytic_analysis_recurring_view.xml',
     ],
-    'demo': [''],
+    'demo': [],
     'test': [],
     'installable': True,
     'images': [],