Add git dotfiles

Add:
 * Global git ignore (DS_Store)
 * git config (name/email, tools for source tree, git_template)
 * Post-Commit hook to take a snapshot using the webcam upon commits
Add Ruby dotfiles

Add:
 * gemrc file to minimize gem footprint
 * spec file to add basic coloring
Fix missing prezto symlink

Fix:
 * Missing zpreztorc file symlink for prezto