Fix #2257 - Improve custom select event robustness

Custom form selects use .prev() to find the underlying select field.
This breaks with plugins like jQuery Validate that insert content between
the underlying select element and the custom markup element. This patch
uses prevAll('select').first() to select the closest previous sibling
element to improve the robustness of this functionality.
Added option 'exposeAddClass'

Adding option 'exposeAddClass' adds extra class to exposed element. This fixes a problem with exposing elements with no background(-color).
Handle elements with no classes correctly
Remove tip guides on end

I have a couple of joyrides on my page and I launch them on different situations. I needed to remove existing tip guides to prevent old ones from showing when second joyride starts.

This tiny edit seems to fix the problem.

Code sample:

JS:
$(document).foundation();

function fire1() { $('#first').foundation('joyride', 'start', { ...settings... }); }

function fire2() { $('#second').foundation('joyride', 'start', { ...settings... }); }

HTML:
<snip>
<div id="first"><ol data-joyride>....</ol></div>
<div id="second"><ol data-joyride>....</ol></div>
</snip>
Remove jQuery dependency for custom select improvement

Added a utility function to replace prevAll(selector)
updated examples on section page
delete unnecessary perfix and fix comma mistake
Update _switch.scss

issue https://github.com/zurb/foundation/issues/1615#issuecomment-17443269
Fix minor typos to docs
Merge pull request #2311 from abutler3/fix_docs_pages

Fix minor typos to docs
Merge pull request #2310 from veego/patch-1

Update _switch.scss
Merge pull request #2306 from stonelee/my

delete unnecessary perfix and fix comma mistake
updated sections to be semantic, including new docs
Merge branch 'master' of github.com:zurb/foundation
updated sections so title doesn't carry into pricing tables
fixed #65 and #2067.
changed compass docs, closed #2103
Merge pull request #2300 from niklam/remove-tip-guides

Remove tip guides on end
Merge pull request #2267 from mhchen/custom-select-compatability

Fix #2257 - Improve custom select event robustness
Fix custom form checkbox, select box speed for large lists.