Modifications to play around with reading notes in Excel files. Not completed/working yet and includes debug code.
Updating readme
Merge branch 'master' of github.com:zdavatz/spreadsheet

Conflicts:
	lib/spreadsheet/excel/reader.rb
	test/integration.rb

Manually fixed merges
Adding documentation so I don't lose it. As I often do.
*Adding noteObject to deal with the Object (and ultimately text comment
field) created by excel's madness
*Updated reader and note

Note class no longer extends string for simplicity and debug of class
(pp now works a bit more easily)

Reader has had loads of changes (still WIP) to allow objects of class
Note and NoteObject to be created and combined in the postread_worksheet
function
*Completed addition of notes hash to worksheet

*Bumped revision
*Corrected compressed string formatting - *U (UTF-8) should have been *S
(16-bit string)
*Removed debug message
*Finally got all the debug out....