Converted all tabs to spaces

Used: 
`find . -name '*.java' ! -type d -exec bash -c 'expand -t 4 "$0" > /tmp/e && mv /tmp/e "$0"' {} \;`

That's the **only** change made in this PR.

Source: http://stackoverflow.com/questions/11094383/how-can-i-convert-tabs-to-spaces-in-every-file-of-a-directory/11094620#11094620

Not sure if you wanted this in separate PR's per Spice? I think that would be a little onerous imo.

//cc @russellholt @jagtalon