Merge branch 'master' into Develop

# Conflicts:
#	cps/book_formats.py
#	cps/static/js/libs/bootstrap.min.js
#	cps/templates/detail.html
#	cps/templates/layout.html
#	cps/web.py

Improvement updater (up to 100 releases are loaded at once)
Fix oauth pathes
Fix oauth without registering

cps/helper.py

@@ -225,7 +225,10 @@ def get_valid_filename(value, replace_whitespace=True):
     value = value[:128]
     if not value:
         raise ValueError("Filename cannot be empty")
-    return value
+    if sys.version_info.major == 3:
+        return value
+    else:
+        return value.decode('utf-8')
 
 
 def get_sorted_author(value):