Fix Submodule Fetch Depth (jtmullen#18)

* Don't break branches

* Test all w/o require head

* modify fetch command

* Fix unshallow

Fix Submodule Fetch Depth (jtmullen#18)

* Don't break branches

* Test all w/o require head

* modify fetch command

* Fix unshallow

Fix Submodule Checkout Depth Branches (jtmullen#17)

Fix shallow submodule

Fix test for too small submodule checkout

Remove Redundant Init

Change payload for sub fetch test

Remove unneded test params

No fetch in second submodule update

Init

Warn to upgrade

Handle New Submodules (jtmullen#15)

* Warning for new submdoule

Handle New Submodules (jtmullen#15)

* Warning for new submdoule

Readme Syntax Fix

Improve Checkout Safety (jtmullen#9)

* Error Handling

* Log cleaner

* Update readme