Add and configure developer setup helper scripts

Configure GitSetup scripts for KWSys.  Run them from a single
SetupForDevelopment.sh script.

Change-Id: Ic4f02175fd65e2f4fe5688e43313766c2b23458f

.gitattributes

 .git*            export-ignore
 
+/GitSetup        export-ignore
+/SetupForDevelopment.sh  export-ignore  eol=lf

GitSetup/config

+[hooks]
+	url = http://public.kitware.com/GitSetup.git
+[gerrit]
+	project = KWSys
+	site = http://review.source.kitware.com
+	pushurl = $username@review.source.kitware.com:KWSys

GitSetup/setup-aliases

+#!/usr/bin/env bash
+echo "Adding 'git prepush' alias" &&
+git config alias.prepush 'log --graph --stat origin/master..' &&
+echo "Adding 'git gerrit-push' alias" &&
+git config alias.gerrit-push "!bash GitSetup/git-gerrit-push" &&
+true

SetupForDevelopment.sh

+#!/usr/bin/env bash
+
+cd "${BASH_SOURCE%/*}" &&
+GitSetup/setup-user && echo &&
+GitSetup/setup-hooks && echo &&
+GitSetup/setup-gerrit && echo &&
+GitSetup/setup-aliases && echo &&
+GitSetup/tips
+
+# Rebase master by default
+git config rebase.stat true
+git config branch.master.rebase true