Added time travel, content scripts, hooked front-end with timetravel #17
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Changed manifest to add content_scripts;
Added scripts folder inside chrome: now we have two .js files to be added to the user's page via <script> tag. This is done so that our functions can run on the same environment as the user's scripts.
Hooked back and forward buttons to send messages to the page, so that it can triggers timeTravel functionality.