Small code fix

Small code fix for meridiem format  dropdown. am//pm is now selected by
default
Added new row for dividers

Added new dropodowns' row for dividers and hacked bootstrap olumns
length to suppprt two and a half columns
Added the datecoderjs file and script tag added to index.html
Basic test code added to datecoder.js, nothing working yet.

Note: In next update, I am going to add default divider options and the
default date code in the <pre></pre> container.