2006-11-29 v0.08
  * Documentation
  * All methods will return either arrays or references based on wantarray.
  * Added dependancy on "use constant" to Makefile.PL
2006-11-05 v0.07
  * Added Excel Document
2006-11-04 v0.06
  * Major interface changes
2006-11-04 v0.05
  * Documentation
2006-11-04 v0.04
  * Documentation
2006-11-04 v0.03
  * Fixed type-O in Meta.yml
2006-10-31 v0.02
  * normalized heading to be positive
2006-10-30 v0.01
  * Original version