Password field updated. Added custom submit handler.

Updated the password field to be of type password. Because we are saving a password to the variables table we need to hash the password instead of clear text we need to write our own rendition of system_settings_form_submit() so that the password gets saved correctly.
Edited admin settings form.

Added the #attribute to the array on the password field. The attribute that is added is 'autocomplete'. We set this value to 'off' so that the browsers don't try and automatically pre-populate the fields with stored passwords and usernames.
Merge branch 'master' of github.com:grantdobbe/commerce-shipstation into code_review
Fixed logic check on password sent from ShipStation.

Passing the password sent from ShipStation through the user_hash_password() function so we can compare the hash with the one stored in the database.
Fixed typo.
Merge branch 'code_review' of github.com:grantdobbe/commerce-shipstation into code_review

Conflicts:
	commerce_shipstation.admin.inc