2.0-wip: Updated to version 1.5 of Glyphicons Halflings set along with some enhancements

Created by: buraktuyan

This updates the icon sprites and classes to the latest version of Glyphicons Halflings set (v.1.5) along with some icon enhancements like:

• Updated the Gylphicons Halflings set to version 1.5 (30 new icons)
• Optimized the sprite PNG files for minimum filesize without any quality loss
• Renamed the sprite image files to save a few bytes here and there (from glyphicons-halflings-sprite.png to lyphicons-halflings.png and from glyphicons-halflings-sprite-white.png to glyphicons-halflings-white.png)
• Made some fixes for horizontal alignment at the LESS/CSS level (tags, bold, arrow-up, minus, chevron-down)
• Made some fixes for vertical alignment at the LESS/CSS level (chevron-down, resize-vertical, resize-horizontal)
• Renamed the old calendar class as list-alt class (because now we've a real calendar icon)
• Changed the background-position of the icon class to 14px 14px, so that a wrong class name will not be showing the glass icon and instead will show a blank icon (which is useful for just positioning the text after the icons in some cases)
• Added new icons (classes) to the base-css Docs (to both HTML file and Mustache template)
• Changed one of the button examples to danger style and used a white icon class

NOTE: I've contacted to the designer of the Glyphicons icons and Jan responded that he has an agreement with the creators of Bootstrap, they are allowed to use Halflings set (including all future updates) as a PNG sprite. (I purchased Glyphicons PRO for my own use, and this is how I'm easily providing a new updated sprite both in black and white colors.)

TESTED with Google Chrome 17, Internet Explorer 8 and Firefox 9.01 on a Windows 7 machine.

QUICK LOOK to the changes (new icons, and updated example): http://i.imgur.com/kGmag.png