Don't print markup in _s_content_nav() when it is not needed. Fixes #28.

Added checks for previous (or parent) and next post in _s_content_nav() before printing any navigation-specific markup. Same approach for when using the function to print pagination links on a posts set for less than two pages.
updated the styles for the buttons, switching from using background css gradients to using box-shadow techniques
Updated read me.txt to include information about http://underscores.me
Only show publish promo to users that can publish

In our no-results template, there's no point in displaying a "publish your first post" promo to users that don't have the ability to publish posts since they can't act on it.
Replace small-menu.js with navigation.js inspired by Twenty Twelve.

Doesn't use jQuery, slightly easier to understand, uses a media query for max-width, rather than JS events making it faster to respond.
Layouts were broken by 752d08afd7d4ecee453a58ca35c18f4ae74b8a71. This commit fixes the layouts according to the new naming conventions.
_s: Add 'site-navigation' class to image.php's image navigation container.
Add a languages directory and a readme file to help get started with translations. props @pixolin
changed readme.txt into README.md for better readability on Github
Merge pull request #73 from kovshenin/patch-10

Add a languages directory and a readme file to help get started with translations
Merge pull request #38 from kovshenin/patch-6

Don't print markup in _s_content_nav() when it is not needed. Fixes #28. props @kovshenin
Merge pull request #39 from hugobaeta/master

Simpler styles for default reset buttons and an updated readme.txt props @hugobaeta
Merge pull request #75 from ashfame/readme_git_style

Changed readme.txt into README.md for better readability on Github
Merge pull request #67 from kovshenin/patch-9

Fix default layouts broken by 752d08a
Merge pull request #71 from philiparthurmoore/bugs/patch-1

Add 'site-navigation' class to image.php's image navigation container
Renaming inc/tweaks.php to inc/extras.php and including by default in functions.php
Use a filter for wp_title instead of hard-coding things in header.php
Rename translations to languages, see #73 and #50
Corrected two typos

"don't" with &apos; should be more correct than &rsquot; (or is it better to escape it \' ?)
I personally find the line * translators: %1$s: smiley */ pretty confusing, but at least it should be singular (not smilies)
Update README.md

Edited some typos and improved some phrases.