remove mobile_library and index from examples

index was just detecting mobile and choosing which layout to render
now htaccess just rewrites to library.php directly
fix download.php

path to libZotero
path to Zotero icon in frame header
remove jqueryUI include
minor fixes to library example

-fix some markup issues
-move a couple rules to from theme_style3 to bootstrap_library_style and stop
using theme_style3
- rearrange bootstrap style so rules applying to different widgets are grouped
together
- make file input button non-native in upload dialog
- update libZotero
update use of css utility classes to use bootstrap

mostly left/right to pull-left/pull-right