Integration with Unite, if installed

[rafi]

Unite is a multi-purpose plugin platform for Vim. I've changed BookmarkShowAll() to check if Unite is installed and has a source named 'quickfix', if it's installed, open it instead of the quickfix window.

[MattesGroeger]

Thanks for your contribution @rafi 👍

[alexandnpu]

Thanks to make this happen. it is really what i want.
Thanks again for introducing Unit to me.

To use this functionality, besides Unite, you have also to clone https://github.com/osyo-manga/unite-quickfix.

[rafi]

Cheers guys. By the way, to set a context globally for the 'quickfix' source:

call unite#custom#profile('source/quickfix,source/location_list', 'context', {
    \   'winheight': 13,
    \   'direction': 'botright',
    \   'start_insert': 0,
    \   'keep_focus': 1,
    \   'no_quit': 1,
    \ })

[MattesGroeger]

Hey @rafi, would you mind to add some small documentation to the Readme.md and docs/bookmarks.txt? That would be great!

[rafi]

@MattesGroeger pushed, see #57.
@alexandnpu checkout my Unite configuration