update bower.json, setup.sh

add 'x-editable' as  dependent package in 'bower.json'
update 'setup.sh' for installing 'x-editable'

also add a few lines into  'setup.sh'
- rename 1 dir in 'bower_components'
 - rename from 'bootstrap' to 'bootstrap-docs'
 - this is  for sucessfully finishing 'grunt copy:bootstrap-docs' task