Adds bootstrap-datepicker

 modified:   Gemfile
 modified:   Gemfile.lock
 modified:   app/assets/javascripts/application.js
 modified:   app/assets/stylesheets/application.css
Reworks the Cheque form to use bootstrap directives and the datepicker

 modified:   app/views/chequs/_form.html.erb - form in horizontally aligned
              and datepicker is integrated
Adds extra information and formatting to the Cheque show view

 modified:   app/views/cheques/show.html.erb