Added option to turn off falling back to substitute on <count>[sS]. Added functionality for seeking with counts.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	plugin/seek.vim
Added actual resolving of seek into helper functions, use these in all existing functions.
Moved configuration of behaviour of <count>s to mapping setup.
change substitute command emulation to something repeatable
fix substitute taking a count to work correctly
fix indentation converting tabs to spaces
fix closing backticks in readme markdown
remove default setting of seek_subst_disable since 'get' handles it
use v:count1 for seek count default