Git pre-commit hook to format src.

[rabbah]

Adds a pre-commit hook script to format go src.

Sample hook:

> cat .git/hooks/pre-commit
#!/usr/bin/env bash

set -e

# format all scala soruce
$OPENWHISK_HOME/tools/git/pre-commit-scalafmt-native.sh

# format all go source
ROOT_DIR="$(git rev-parse --show-toplevel)"
$ROOT_DIR/tools/git/pre-commit-gofmt.sh

# scan all other files for conformance
python $OPENWHISK_UTILS_HOME/scancode/scanCode.py --config $OPENWHISK_UTILS_HOME/scancode/ASF-Release.cfg "$ROOT_DIR"

@mrutkows perhaps we should add the scala formatting and pre-commit hooks to the utils repo so that there is a canonical place for these to be accessed from all the repos.

Related to #324.

[mdeuser]

not sure where x is used

[rabbah]

not sure where that came from! removed. thanks.

[rabbah]

@dubee @mdeuser if you're ok with the PR can you approve and merge?