Adds pre-commit hook, hook config script, and a README

The pre-commit hook will automatically gofmt code in place, warning you
about any changes. It will also fail to commit if either golint or go
vet fails.

project/hooks/pre-commit

@@ -0,0 +1,29 @@
+#!/bin/sh
+
+REPO_ROOT=$(git rev-parse --show-toplevel)
+RESOLVE_REPO_ROOT_STATUS=$?
+if [ "$RESOLVE_REPO_ROOT_STATUS" -ne "0" ]; then
+	printf "Unable to resolve repository root. Error:\n%s\n" "$RESOLVE_REPO_ROOT_STATUS" > /dev/stderr
+	exit $RESOLVE_REPO_ROOT_STATUS
+fi
+
+cd $REPO_ROOT
+
+GOFMT_ERRORS=$(gofmt -s -l . 2>&1)
+if [ -n "$GOFMT_ERRORS" ]; then
+	printf 'gofmt failed for the following files:\n%s\n\nPlease run "gofmt -s -l ." in the root of your repository before committing\n' "$GOFMT_ERRORS" > /dev/stderr
+	exit 1
+fi
+
+GOLINT_ERRORS=$(golint ./... 2>&1)
+if [ -n "$GOLINT_ERRORS" ]; then
+	printf "golint failed with the following errors:\n%s\n" "$GOLINT_ERRORS" > /dev/stderr
+	exit 1
+fi
+
+GOVET_ERRORS=$(go vet ./... 2>&1)
+GOVET_STATUS=$?
+if [ "$GOVET_STATUS" -ne "0" ]; then
+	printf "govet failed with the following errors:\n%s\n" "$GOVET_ERRORS" > /dev/stderr
+	exit $GOVET_STATUS
+fi