Few fixes found in code review
Added <style> and <script> extraction smart tag
Small refactorings
Added "Remove Empty Lines" command and refactored
Merge branch 'master' of github.com:madskristensen/WebEssentials2013 into code-cleanup

Conflicts:
	EditorExtensions/Commands/Shared/RemoveDuplicateLinesCommandTarget.cs
	EditorExtensions/Commands/Shared/SortSelectedLinesCommandTarget.cs
HTML-encode extracted filenames