adding the first challenge into overview-and-updates in html
solved first challenge adding the HTML5 doctype
adding the second challenge into overview-and-updates in html
changed challenge folders organization, also added explanations about meta
solved problem with the new meta tag definition
removed unnecessary file
added a problem to be solved with new script tag definition
solved problem removing the script type once it wasn't necessary in the new specification
add a new challenge to be solved with HTML5 link
solved using the new HTML5 definition of link tag
added a new problem about the new i tag semantic
solved problem tagging whith i tag the specified text
added a new problem to be solved with new semantics
solved adding tag b and a lead class
new problem to solve with html5 new semantics
use the em tag to express stress emphasis
add a new problem to be solved with HTML5 new semantic
solved using strong tag to express strong importance
Merge pull request #1 from helmedeiros/overview-and-updates

Reviewed and updated HTML concepts' acknowledgement to the new specification on its 5th version.