Simple brainf*ck interpretter

It is a simple satire language with simple rules:

•  >       Increment the data pointer (to point to the next cell to the right).
  

•  <       Decrement the data pointer (to point to the next cell to the left).
  

•  +       Increment (increase by one) the byte at the data pointer.
  

•  -       decrement (decrease by one) the byte at the data pointer.
  

•  .       Print out the character
  

•  ,       Get one char/ byte of input
  

•  [       Begin while(the value in memory at the mem ptr is not 0)
  

•  ]       end while
  

*/