fix powerline path nesting
adding vimrc.before for powerline & tigrc
new git aliases:

1. ci --> "commit -v"
2. find --> use selecta for interactive branch checkout
3. df --> "diff --word-diff=color"
4. pl --> "pull --no-rebase"
vim: retain scrollback buffer on quit
strip out right bar on tmux powerline
vim: selecta mappings
add taskrc for http://taskwarrior.org