Smelter -> Circus + Tailor, change buildpack flag

-buildpackOrder a,b,c -> -buildpack a -buildpack b -buildpack c

Signed-off-by: Amit Gupta <agupta@pivotallabs.com>
Revert "Smelter -> Circus + Tailor, change buildpack flag"

This reverts commit 25e68cefdd09a49e4a11884c75d18e68affb917e.
move smelter into tailor binary

Signed-off-by: Amit Gupta <agupta@pivotallabs.com>
[oO]utputDir -> [oO]utputDropletDir, (cont'd)

[rR]esultDir -> [oO]utputMetadataDir

Signed-off-by: Amit Gupta <agupta@pivotallabs.com>
more smelting -> tailoring

Signed-off-by: Amit Gupta <agupta@pivotallabs.com>