Docs: Improve info regarding IE's document modes

Ref h5bp/html5-boilerplate#1554
Close h5bp/html5-boilerplate#1446
Add vertical centering for `iframe`

Remove gap between the `iframe` elements and the bottom
of their containers by vertically centering them.

Close h5bp/html5-boilerplate#1613
Move `update_dist_directory.sh` into `bin/travis`

Make it even more clear that the `update_dist_directory.sh`
is intended for Travis¹, and not for the user to run it.

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¹ http://docs.travis-ci.com/
Docs: Fix wrong homophone in `html.md`

Close h5bp/html5-boilerplate#1616
Update content from the `dist` directory [skip ci]
Further losslessly compress images

 * apple-touch-icon-precomposed.png

   before:         3962 B
   after:          3959 B
   ──────────────────────
   reduction:         3 B [0.07%]

 * tile.png

   before:         3495 B
   after:          3482 B
   ──────────────────────
   reduction:        13 B [0.37%]

 * tile-wide.png

   before:         1864 B
   after:          1854 B
   ──────────────────────
   reduction:        10 B [0.53%]
Make consistency changes in `test/tests.js`
Add `test/tests.js` in the JSHint check
Update content from the `dist` directory [skip ci]
Add `test` to the list of dirs from `package.json`
Separate jQuery URL test into two different tests
Add JSCS JavaScript code style checker to build

Ref https://github.com/jscs-dev/node-jscs#readme
    h5bp/html5-boilerplate#1617
Remove lint options covered by JSCS from .jshintrc

Ref https://github.com/jscs-dev/node-jscs#rules
Close h5bp/html5-boilerplate#1617
Update Apache Server Configs to v2.9.0
Replace short links with original links

While the short links look "nicer" and can be useful (e.g.: stats),
when our site (http://h5bp.com) goes down, it prevents users from
accessing the information they point to.

Close h5bp/html5-boilerplate#1619
Enforce `LF` newlines

This change is done in order to ensure that Windows users don't
encounter any newline related issues.

e.g.: Prior to this change, after the build script was run, files
from `node_modules` (having `LF` newlines, and which wouldn't have
be normalized by `git`) would be copied to the `dist/` directory
and would appear to Windows users as if they where changed.

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Thanks to @XhmikosR for pointing this out!

Ref http://git-scm.com/docs/gitattributes#_effects
    http://en.wikipedia.org/wiki/Newline

Close h5bp/html5-boilerplate#1618
Enforce `LF` newlines also for hidden files
Update Apache Server Configs to v2.10.0
Rename Apple touch icon & add <link> in index.html

Until now we recommended to our users to include an image named
`apple-touch-icon-precomposed.png` in the root of their website.

Since the iOS 8 release however, Safari will no longer request¹
the `/apple-touch-icon-precomposed.png` by default, and instead,
it will make the following requests¹:

    /apple-touch-icon-152x152-precomposed.png
    /apple-touch-icon-152x152.png
    /apple-touch-icon.png

In order to fix this issue we decided¹ to rename
`apple-touch-icon-precomposed.png` to `apple-touch-icon.png`,
and include a `<link>` element in the `index.html`:

    <link rel="apple-touch-icon" href="apple-touch-icon.png">

Notes:

  * Just renaming `apple-touch-icon-precomposed.png` to
    `apple-touch-icon.png` would have also worked², even with
    older version of iOS. Unfortunately, it wouldn't have
    represented a good solution as Apple may change again what
    is requested by default, plus, it would have generated quite
    a few 404s³.

  * We decided to rename the touch icon because most iOS users⁴
    are on iOS 7+, so the `precomposed` keyword no longer brings
    much benefit (as of iOS 7, no special effects are applied to
    touch icons).

  * Adding `<link rel="apple-touch-icon" ...>` in `index.html`
    will also allow⁵ (some of) the default Android 2.2+ browsers
    to use the touch icon.

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¹ h5bp/html5-boilerplate#1615

² https://mathiasbynens.be/notes/touch-icons
  https://developer.apple.com/library/ios/documentation/AppleApplications/Reference/SafariWebContent/ConfiguringWebApplications/ConfiguringWebApplications.html

³ https://code.google.com/p/chromium/issues/detail?id=259681
  h5bp/html5-boilerplate#1615

⁴ According to Apple (as measured by the App Store on October 13, 2014):

    * 5%  iOS < 7
    * 47% iOS 7
    * 48% iOS 8

  From: https://developer.apple.com/support/appstore/
        https://cloud.githubusercontent.com/assets/1223565/4720999/2aa8ba26-5935-11e4-9492-92ff6a50ad7d.png

⁵ http://www.ravelrumba.com/blog/android-apple-touch-icon/

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Close h5bp/html5-boilerplate#1622