Add default config for Docker.
Merge branch 'master' of github.com:lexrus/.files

# By Mathias Bynens (4) and others
# Via Lex Tang (2) and Mathias Bynens (1)
* 'master' of github.com:lexrus/.files:
  bootstrap.sh: Make `rsync` output numbers in a human-readable format
  Brewfile: Install Node with npm
  Brewfile: add instructions on how to change the default shell to Bash 4
  .bash_profile: Enable tab completion for `git` and `g`
  .bash_prompt: Speed up the Git commands for the prompt
  Brewfile: Install `hashpump`
  .gitconfig: Make sure `go` never overrides branches