gui.ui: first destroy children, then itself
widgets.pager: clear image on exit
doc/rifle.1: Added man page for rifle
doc/rifle.1: added whitespace at examples
setup.py: add doc/rifle.1 to man pages
widgets.pager: fix redrawing when scrolling
widgets.browserview: clear image when (un)collapsing preview
core.loader: handle race condition when process quits unexpectedly
widgets.browserview: shorter implementation of f4e5ce0
widgets.browserview: clear image when drawing bookmarks etc
gui.ui: clear image when opening taskview/pager
Merge branch 'master' into vcs