Added some experimental PDF generating stuff
Merge branch 'dev' into dev-rake-tasks
Merge branch 'dev' into dev-rake-tasks
Separate tasks into the files
Exclude list added
Utility class for erb-files rendering added
PDF-page layout changes
Rake tasks added
PDF book templates and stuff added
Some styles changes according to use them in generating PDF
Gemfile added
Added some utilities to Rakefile
Some styles refactoring
PDF styles improvements