Changes in version 0.5
   - improved printing
   - improved documentation
   - fixed problem with mathjaxr (Thanks Kurt Hornik)
   
Changes in version 0.4
   - depend on later version of mathjaxr

Changes in version 0.3
   - improved documentation
   - allowed for input of I2
   - improved error checking
   - improved layout of printing
   
Changes in version 0.2
   - updated DESCRIPTION
   - edited documentation

Changes in version 0.1
   - version not released