Fixed blank target in documentation posts

_posts/2015-06-10-contact-tutorial.md

@@ -18,4 +18,4 @@ Then in the \_config.yml set the email variable to your email.
 
 Don't be afraid of Email Harvesting, write your email properly, and the page will perform javascript obfuscation.
 
-<small>Many thanks to <a href="https://github.com/joariasl" target="blank">@joariasl</a> for this feature!</small>
+<small>Many thanks to <a href="https://github.com/joariasl" target="\_blank">@joariasl</a> for this feature!</small>

_posts/2015-06-20-blog-tutorial.md

@@ -46,7 +46,7 @@ vkontakte-share: True
 
 ### Comments
 
-And you can enable <a href="http://www.disqus.com" target="blank">Disqus</a> comments by just setting your Disqus username here:
+And you can enable <a href="http://www.disqus.com" target="\_blank">Disqus</a> comments by just setting your Disqus username here:
 
 <pre style="text-align: left">
 disqus-shortname: "YOUR DISQUS USERNAME"

_posts/2015-06-25-html-head-tutorial.md

@@ -43,4 +43,4 @@ In order to serve the website locally just run:
 ./scripts/serve
 </pre>
 
-<small>Many thanks to <a href="https://github.com/joariasl" target="blank">@joariasl</a> for the language support! </small>
+<small>Many thanks to <a href="https://github.com/joariasl" target="\_blank">@joariasl</a> for the language support! </small>

_posts/2015-06-27-welcome.md

@@ -11,4 +11,4 @@ Click the view more posts link bellow, to see the currently available post-tutor
 Note that every time you update the site configuration (\_config.yml), you will need
 to cancel the serving (*Ctr + C*) and serve the website again.
 
-Any contributions, feedback or issues to the <a href="https://github.com/PanosSakkos/personal-jekyll-theme" target="blank">repo</a> are more than welcome!
+Any contributions, feedback or issues to the <a href="https://github.com/PanosSakkos/personal-jekyll-theme" target="\_blank">repo</a> are more than welcome!