title: nsformatter and decimal number
body: <p>I m using nSformatter for a calculator app. 
  When computing, for example : 6 divided by 10 , nsformatter gives me :   .6  instead of the much desired 0.6  . 
  For decimal numbers smaller than 1 , the 0 is omitted by NS formatter.
  Of course, I wrote a couple of lines to append the resulting string with a 0 but my question is :
  Is there an option in Nsformatter , to achieve the desired result ?</p>
  
  <p>No more    .6  but   0.6  ?</p>
  
  <p>Thank you all </p>