hide last breadcrumb elements on mobile views (see msg)

create a class called 'breadcrumb-last' and apply it to all views. it hides the page title and last &raquo; element on all single post pages when viewed on handhelds. this hides these things on the other views so set it to 'display:inline' in those spots so it's visible. apply this class to all post pages via the '_includes/post_breadcrumbs_partial.html' Jejyll include.
add top margin to the nav/search element in the tablet portrait view
forgot to add to previous commit (10594e38e7...)
make multiline comments single line in styles.css build (see msg)

SASS does not remove multi-line comments when it compiles from .scss to .css.  this chunks up the development copy of the main stylesheet (styles.css) so convert all multi-line comments in .scss files, build styles.css, then test.