Template: breadcrumb - small fixes

- undefined variable on author page
- wrong html structure on hierarchical page
Template: breadcrumb - category structure

The html structure of multidimensional categories was wrong ($before &
$after was missing).
Display on blog (if not front page)

The breadcrumb should be displayed on the blog page, if it's not the
front page.
fixed wc_get_customer_available_downloads() query, closes #6057
Set simplify user agent
Allow extensions to hijack i18n_product_type_alert
Added Nepali Currency and Symbol.
Tab index fix for PYG Currency and Symbol.
Added Lao Kip Currency
Added actions before and after all available downloads

For `my-downloads.php` template file
Simplfy typo
updated the .pot files
stopped deprecated warnings about like_escape() function since WP 4.0
options.include for makepot admin task

Added an `includes` option for the `makepot` task to specify which files should be scanned.
`grunt-wp-i18n` has now support for [options.include](https://github.com/blazersix/grunt-wp-i18n#optionsinclude)
Updated grunt-wp-i18n to 0.4.7 to support options.include
fixed the paypal process_refund() method
Merge pull request #1 from woothemes/master

Updated WooComerce
added sandbox support for paypal transaction url
Added paypal refund reason/note

cc @mikejolley
Merge pull request #6067 from axistools/NPR-Currency

Added Nepali(NPR) Currency and Symbol.