Added style elements

There are now custom css files and a background image.
"karaoke.style.js" has also been added.
Added styling files.

I added new css files and js style files.
I had to revert the karaoke.admin.js file.
Added OG tags.
Added highlight classes.
Added styling to user pages.
Modified style of 3 committed files.

Removed "Reggie Gulle" attribution in footer of publicly accessible
index.php page.  Errors are now echoed in "changepassword.php",
"login.php", and "update_video.php".
Added Title and Singer Text

Under the video player, text is now displayed showing the Title of the
song and it's singer/s.
Added new column to the table

Now, there is an "added_by" information column in the table, indicating
to Registered Users who amongst them added new videos.