Should migrate from wget to curl

[skroll]

By default, wget is not installed on OS X. Script should be migrated to use curl instead, one less dependency.

[jimbobmcgee]

I've got a pull-request outstanding which rewrites some non-POSIX 'Bash-isms'. One of these is the use of wget. My version checks if curl is on-path and uses it, otherwise checks if wget is on-path and uses that; else fails outright.

Yours if you want it...
#10