rename file-server to file_server

Signed-off-by: Dave Liebreich <dliebreich@pivotallabs.com>
Bump src/executor, src/inigo, src/linux-smelter, src/stager

Bump cloudfoundry-incubator/executor:
  Alex Suraci:
     send back a meaningful out of memory error when an oom event occurs ( Travis Success: https://travis-ci.org/cloudfoundry-incubator/executor/builds/20961582 )
     bumpdeps ( Travis Unknown )
Bump cloudfoundry-incubator/inigo:
  Alex Suraci:
     137 => out of memory
  David Varvel:
     make rsync remove extraneous files when copying dependencies into the container
Bump cloudfoundry-incubator/linux-smelter:
  Alex Suraci:
     Merge pull request #2 from fraenkel/args
  fraenkel:
     Pull arguments from command line
Bump cloudfoundry-incubator/stager:
  Alex Suraci:
     Merge pull request #2 from fraenkel/args ( Travis Success: https://travis-ci.org/cloudfoundry-incubator/stager/builds/20962400 )
  fraenkel:
     Use arguments instead of environment variables ( Travis Unknown )