Change removeChild to the more direct remove
Move comparison to a variable
Change x to note to be more readable
Remove unneeded this binding on forEach loops
Merge branch 'simplify'
Explicitly declare variables as null

These are just the variable that will be sent over to popup page. It will
help with error messaging for pages that either have no notes, or the
content script doesn't have permissions for.
Rely on the variable being null
Move notesStr and urlStr into if statement

This is so we know that the varible will end up either null or the correct
string format. Sometimes their would be undefined to the url, eg.
<noteURL>undefined
Add a basic error message function
Add a bit of control for when there is no reponse
Add style to error message
Merge branch 'fix/no-notes'