commit and push after spork promote
added : for consistency
make auto_push optional
get cwd and use commit in git gem
use FileUtils instead of backticks
use git gem to push to master
pass branch to push to for spork promote
add default branch if no branch was passed to cli_params as in the case of knife spork omni
add documentation on git auto_push
specify branch to push to in config
Fixes #141: do not attempt to load Berksfile if not present
Update slack.rb

add supporting of images into slack.
Add README changes
Merge branch 'auto_push' into auto_push_master
relax foodcritic version requirement

...from `~> 3.0.0` to `>= 3.0.0`

4.0.0 is out and both the docs and error message say `>=`. 4.0.0 is working fine for me with this change.
add support for rubocop >= 0.23.0

in 0.23.0 they renamed `Rubocop` module to `RuboCop`
get parent of pwd
do not add all pending changes
updated instructions
spork promote to multiple environments