Include gitconfig.local file for personal changes

* assumes same directory existance
* allows for easier addition of personal configs
Include local aliases file

* `.aliases.local` should be used to add personal aliases
Source ~/.zshrc.local if it exists

Follows the pattern of:

* ~/.aliases.local in ce7ad49
* ~/.gitconfig.local in 8e141fe
* ~/.vimrc.local in a666267

Use consistent:

* `source`ing style.
* commenting style.

I am using ~/.zshrc.local as a home for `eval "$(rbenv init -)"`.
Remove "DO NOT EDIT BELOW THIS LINE" convention

It has been superceded by a `.local` suffix convention.
Personalize git username and email.
alias goodmorning
Code metric aliases: flog, rbp, reek
Alias irb with completion.
Move rbenv setup to zshrc.local (from zshenv)