reworked readme.txt and style.css

added some more help and links in the style.css

changed version number
css changes on some responsive parts
corrected the previous and next tabs that appear in BP members and groups profiles nav when there are too many tabs.
fixed header, header search bar and header logo CSS

fixed most content width related bugs for different settings and fixed the function creating the content width for the CSS

tweaked activity stream and activity comments
fixed sidebar CSS classes for member and group profile sidebars