Merge pull request #1 from Gerk/master

Update contentscript.js
Merge pull request #4 from Gerk/master

pretty much rewritten
Merge pull request #5 from Gerk/master

added url and postURL
Merge pull request #6 from Gerk/master

added composite to wanted keys
Merge pull request #7 from Gerk/master

new version
Check 'key' value for https
Merge pull request #2 from sander1/master

Check 'key' value for https