Clean up "Build completed" message

[whatcould]

Multiple members of my team were distracted by this emoticon, which is backwards from the traditional version (in this country anyway), :) — somehow it always looks like a :( frown as it slides by on the console.

Also took the opportunity to add "Hologram", since in our situation where you're scanning a lot of build output, it's helpful to be specific about what just finished.

• Remove distracting backwards emoticon
• Add “Hologram”, which is helpful messaging in a multiple-build situation