Fixed performance issue caused by loading config multiple times

[tamccall]

Fixed performance issues caused by loading config after every file load

See attached cpu profiles for more info on performance issues.
Measured cpu profile on make integration in both cases
cpu-profile.zip

Also fixes #104

[codeactual]

I think there are several opportunities to improve this for review-ability and scope.

• Remove as many file changes as possible which are not critical to the PR. GitHub says that 1,889 files were changed and 823,428 lines were added. A quick look at the manifest shows things like vendor tests, JS, and other non-Go code files.
• Consider splitting the -cpuprofile feature into a separate PR from the performance fix. I see how they were related in origin but they're easier to review apart.
• Package management seems endlessly controversial. I've used glide, worked well for me. But adoption of it might also fit better in its own PR that is only about packaging.

[tamccall]

Fair enough I'll just get the relevant changes in here.

But FWIW vendoring is something that should seriously be considered

[tamccall]

Added cpuprofile cli option PR #134

[tamccall]

Added issue to discuss preferred vendoring tools #135