a few fixes in a row

[besser82]

• fixed grep: invalid max count
  • manning-up.sh had an error making grep for title fail
• add output of file being processed
  • some output about which file gets processed by ronn, makes debugging easier
• add missing hashbang
  • there was the hashbang missing in bin/git-obliterate
• remove /usr/bin/env from hashbang
  • hashbang should not call shell-interpreter using env
• fix complains from checkbashism -px
  • some scripts used bashisms, but relied on /bin/sh
  • /bin/sh neccessarily not needs to be symlinked to /bin/bash

[hemanth]

@besser82 This needs a rebase.