adding comments to MULTIPART section
s/multi-part upload/MULTIPART UPLOAD OPERATIONS/

to match the actual heading of that section, so you can find it

Conflicts:

	lib/Net/Amazon/Glacier.pm
improvements to POD

Fixed some typos, changed the pod to match the code, added linebreaks to make
it easier to read, wrapped at 80 columns to make it easier to proofread.

Conflicts:

	lib/Net/Amazon/Glacier.pm
removing pod about multipart not being implemented

...because gbarco implemented it
fixing link in pod in last commit
Merge pull request #3 from kgoess/doc-fixes

Doc fixes by Kevin.