According to endbosses' suggestions.

Feature specs that were using javascript took a long time to finish
(about 10x longer) and where hitting Poltergeist timeouts.

This modification skips using javascript with select2 selecbox, thus it
is faster, but this also does not check some JavaScript related
features.

`Issues::CloseService#execute` signature has changed, because of using
keyword parameter for commmit.

This also adds confirmation message if issue move has been requested.

This will preserve those changes in history, we may need them in future.
Currently we will use a issues helpers to create options to choose
project whem moving issue to it.

[ci skip]

This also refactores ProjectSelect adding some decorator-like functions.

Discussed it here:
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/2831#note_4190228

This also wrapps entire process into transation, as rewriting references
may have large memory footprint.

Fix wiki search results point to raw source

Closes https://github.com/gitlabhq/gitlabhq/issues/9581

See merge request !3138

Follow the CSS Style Guide rules for unitless zero values.

Discussed in #14299.

cc: @rspeicher @jschatz1 

See merge request !3259

Updated Emoji Rake task to conform to style guide.

Discussed in #14299.

[ci skip]