Added bootstrap (3.2.0) files: css, js, fonts;
Added jquery
Added beans schema declaration in spring config files
Fixed: sidebar tile id changed to "sidebar" (was "header")
Added style.css file for site styles
Added including of all resources (bootstrap.css and .js, jquery.js, style.css)
in main_template.jsp
Added header images
Implemented header.jsp
Added servlet-api dependency to maven (for expression language)
Added images for votes for posts
Added method for getting negative and positive marks and rating to Post class
Added tiles-el dependency to maven to support expression language in JSP.
Updated web.xml version to 3.0
Removed unnecessary dependencies from Maven;
Version of Tiles dependencies extracted to property.
views.xml renamed to tiles.xml;
removed unnecessary property from TilesViewResolver bean declaration.
Added tiles-extras dependency to Maven to support tiles tag library.
Merge branch 'master' into view

Conflicts:
	src/main/resources/spring-tiles.xml
	src/main/webapp/WEB-INF/web.xml
Merge branch 'master' into view
Imposed home page;
Added css styles for page displaying.
"Imposed" post page.
Added methods to count positive and negative marks of comment to Comment
class.