Handle manuscript submission workflow

Description

When users complete the review form in #7 (closed), the submission needs to be sent to different states/people and trigger different actions.

Submitter can: Submit manuscript

• If submitter is reviewer, "submit" manuscript for QA
• Otherwise, on manuscript submission, send reviewer email and allow reviewer to claim manuscript

Reviewer can: Reject manuscript, Approve manuscript

• On reviewer rejection, send rejection message to submitter and claim manuscript to submitter
• On reviewer approval "submit" manuscript for QA

Admin can: Reject manuscript, Approve manuscript

• On admin approval, send manuscript for XML tagging.
• On admin rejection, the admin can choose where the manuscript is routed & post a message

Subtasks:

• On manuscript submission, send reviewer email and allow reviewer to claim manuscript
• On reviewer approval "submit" manuscript for QA
• On reviewer rejection, send rejection message to submitter and claim manuscript to submitter
• Admin can reject submission and send message to submitter OR reviewer
• On admin approval, send manuscript for XML tagging

Waiting on #34 (closed) to complete.