Fixed zsh/zshrc.symlink

Last line (#22) should be "completion.zsh", not "completion.sh".
Merge pull request #42 from program247365/patch-1

Fixed zsh/zshrc.symlink
Rename git completion script
Delay sourcing of completion.zsh files
Fix typo.
Added a check so the install script does not use homebrew on *nixy systems
Merge pull request #47 from giodamelio/master

OS check
system: Don't add brew prefixes if we aren't on an actual machine with brew installed.
short explanation: bootstrap script broken

know-it-all explanation:
  The test command [ needs a trailing space to be recognized.
  In #!/bin/sh environment, '=' has to be used with the test command.
  ] needs a leading space to be recognized as the last argument of the test command.
Merge pull request #49 from mafulafunk/master

script/bootstrap broken
Make sure we skip the symlink if the user selected to [S]kip all.
Merge pull request #54 from memborsky/skip_all-no-worky

Make sure we skip the symlink if the user selected to [S]kip all.
Make bin/e work with more shells.

Revision is similar to pull request #49 in that it more strictly follows
the POSIX standard for shell scripts by not using "test". Small change,
but it means bin/e will work with more shells on more systems (e.g.
Ubuntu 8+ which links /bin/sh to /bin/dash by default).
Merge pull request #55 from dplarson/master

Make bin/e compatible with more shells
Bump some Sublime settings
Slip in the Boxen changes
Merge pull request #48 from memborsky/holman

Don't prefix brew with grc installed and no brew install.
Merge pull request #46 from mazurov/master

Fix typo in the sublimetext config
Merge pull request #43 from jacobwg/master

Delay sourcing of completion.zsh files
:sparkles: