improve highlight doc
improve some indentation
try to improve highlight
Merge branch 'master' into v1.0

Conflicts:
	plugin/ack.vim
Add, by default, "-s" option.

Ack -s option suppress error messages, this way will not fill quickfix
window with ack errors.
Move function to autoload.

To improve vim's boot process move functions to autoload
remove some duplication
fix highlight, force to highlight the searched term
fix maps to work only on quickfix window
some code improvements
update Goals for 1.0 in README
autofolding results by filename
autoopen and autoclose folds
add auto fold as option
move Roadmap to a Changelog
add documentation for g:ackpreview
do not blow without ack or ack-grep
only apply maps when found results
using v:hlsearch instead of &hlsearch(hlsearch improvements)
put space between ackprg and ack_default_options :bomb:

Thank's @kamelzcs

fixes #110

Conflicts:

	plugin/ack.vim