Overflow fix; Minor css fixes

Overflow fix:
- Added a new container into which the 3d image is rendered.
- Removed my3dcontent border from css and added it in a script, which
also resizes the element accordingly

Minor css fixes:
- Stylistic adjustment for various elements
- Separation of most css from html
Minor commenting fix

Minor fix for css links comments
Merge pull request #4 from mmaciusowicz/master

Overflow fix; Minor css fixes
Minor fixes to filenames and acknowledgements.
Update index and add GA
Merge branch 'master' of https://github.com/findsorguk/MicroPasts-3Dview

Conflicts:
	index.html