Split gmap.html to .html, .js and .css files
Splited gmap.html to multiple files and made needed changes to
dump1090.c-file accordingly.

* Saves last shown map position
- Shows plane count on map incorrectly
- "Reset map"-function is yet to implement

Lacking quite alot functionality; plane listing, notes, etc.

  Changes to be committed:
	new file:   public_html/gmap.html
	new file:   public_html/script.js
	new file:   public_html/style.css
	modified:   .gitignore
	modified:   dump1090.c
	deleted:    gmap.html