Fixed broken URLs for dependencies#196

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sampollard wants to merge 4 commits intojegonzal:masterfrom

sampollard:master

Commits on Nov 8, 2016

Updated URLs for gperftools and boost
Sam Pollard
committed

Commits on Nov 10, 2016

Fixed link for libevent
Sam Pollard
committed

Commits on Nov 14, 2016

Changed the URLs for external packages again
Sam Pollard
committed

Commits on Apr 27, 2017

Added support for 128 cores.
Sam Pollard
committed