default-weight: Change default weight value to 1
message-incomplete: Add "incomplete" message type for errors
Add `max_attempt_reached` message type & update README
Merge pull request #30 from edx-solutions/message-incomplete

message-incomplete: Add "incomplete" message type for errors
Merge pull request #29 from edx-solutions/default-weight

default-weight: Change default weight value to 1
Add display_name to mentoring_default.xml