Create the main plugin file
Add the primary code
Only redirect to admin email when necessary

If the email is already being sent to the admin address, then let it go
through normally.
Add a little space
Reorganize the docblock
Create README.txt
Tweak the plugin URI
Added more sections to the readme.txt file
Updated README.txt file instructions
More details provided in readme.txt file
Further updates to the readme
Include the singleton class
Move the main functionality to a class
Use the WordPress plugin repo URL
Include an activation hook
Use double quotes
Bump the version and update the readme file
Resolve merge conflicts

Conflicts are annoying… always pull first!