add pagination for Twitter Bootstrap 3

add separately slightly different pagination for Bootstrap 3
 - delete 'div' wrapper around 'ul'
 - assign '.pagination' class to 'ul'
change directory and correct description for Bootstrap 2
Merge remote-tracking branch 'upstream/master' into bootstrap3
correct _page templates similar to merged pull #17
there is no need to use rails method to generate simple html
correct bootstrap3 the same way as bootstrap2
Merge pull request #25 from ShPakvel/bootstrap3

add pagination for Twitter Bootstrap 3