Added a collection of OS icons

We won't use all of these naturally, but we can try out each one and see which one works best. Afterwards, we can delete the unnecessary ones.
Removed unnecessary whitespace
Testing a disabled selection default

Currently, if you are running on an unsupported system (e.g. Linux on ARM), the drop down is blank (which isn't very user friendly). A default should help this issue.
Testing removing the "disabled" attribute
Removed the "Operating System" drop down value
Update README.md
Merge pull request #15 from oneski/master

jQuery Fix
Updated return values to Linux/BSD from Unix
Merge pull request #16 from oneski/patch-1

Update README.md
Updated the OS value in index.html from Unix

The new value is "Linux/BSD"
Merge branch 'master' of https://github.com/wpapper/tor-download-web
Deleted Architecture References 

Seemed to be throwing off the update code.
Merge pull request #17 from oneski/patch-2

Deleted Architecture References
Merge pull request #4 from wpapper/master

Update to Master