Revert "Merge pull request #360 from scraperwiki/20130816-tool-symlinks"

This reverts commit 5089bffb018cdf2db76f6e0f343effc190889e94, reversing
changes made to 357ab18bdb7d740e2a3fb51325d4fc7e45a2f4cc.

This broke the magic table scraper, amongst others.
Merge pull request #361 from pwaller/undo-symlink-merge

Revert tool symlinks branch