Add documentation for dimension and weight unit functions.
Added 'wpsc_product_min_cart_quantity' filter.
Fix the product excerpt not to return the additional product details.
Replicated logic from custom meta functions

Allows initialization and upgrade to occur before function files are
included
Merge pull request #532 from benhuson/default_units_docs

Add documentation for dimension and weight unit functions.
Merge pull request #540 from benhuson/minimum_order_qty

Added 'wpsc_product_min_cart_quantity' filter.
Merge pull request #535 from benhuson/get_the_excerpt

Fix the product excerpt not to return the additional product details.
Merge pull request #536 from JeffSparkleGear/Custom-Meta-Init

Replicated logic from custom meta functions
Allow gateway setting forms to be methods of a class
Merge pull request #542 from leewillis77/merchant_api_fix

Allow gateway setting forms to be methods of a class
Bump 3.8.13 version
Item price column was the only column in the cart table without class
attributes.  Added class attributes to allow cart styling of the column
in the same manner that other columns can be styled.  

Removed a couple of extra spaces.

Issue #150
Unde previous (premature) commit
As discussed in #153

My suggestion is leave the 'wpsc_save_cart_item' action alone so we
don't break anything ,deprecate it.

Add a do_action('wpsc_before_save_cart_item', $cart_id, $this ) call
before the cart item record and cart meta is stored into the DB.

Add a do_action('wpsc_after_save_cart_item', $cart_id, $this ) call
after the cart item record and cart meta is stored into the DB.
leave the 'wpsc_save_cart_item' action alone so we don't break anything
,deprecate it.

Add a do_action('wpsc_before_save_cart_item', $cart_id, $this ) call
before the cart item record and cart meta is stored into the DB.

Add a do_action('wpsc_after_save_cart_item', $cart_id, $this ) call
after the cart item record and cart meta is stored into the DB.

Fixed indentation on one line 

As discussed in #154, pull request #153
Replaced wpsc_get_child_object_in_terms

More efficient query, more efficient function
Coding standards

Adjusted line breaks, parenthesis and spacing to conform to coding
standards
config file updates
renamed function
removed log file