allow assemble/run scripts to be supplied in app source or via remote url
Merge pull request #52 from bparees/remote_scripts

enable sti to use remote scripts(assemble/run)
Print usage instead of Go panic for 'sti build' command
Merge pull request #54 from mfojtik/fix_go_panic

Print usage instead of Go panic for 'sti build' command
change scripts dir to .sti/bin
Merge pull request #55 from bparees/relocate_scripts

change scripts dir to .sti/bin