First attempt at build process for parallel infect

Good: standalone works
Bad: Build automation for standalone sucks and is broken.
Adds working Parallel Infect and build step

Adds rakefile namespace :build and task :standalone_parallel.

Dynamically generates a standalone parallel infect bin.  Includes PMap
(parallel map) by querying Gem::Specification.
Merge pull request #2 from zph/add_parallel_downloads

Add parallel downloads
Add exitcode status check and print helpful msg