Removed instances of zci is_cached => 1 -- already set by default

/cc @nospampleasemam @russellholt @yegg 

I noticed the Goodie Tutorial tells the user to write this line, but its actually unnecessary, so I cleaned up the rest of the files in the Goodie repo.

used `find lib/ -type f -exec sed -i '/zci is_cached => 1/d' {} \;`