Fix man page issues:

- Remove some redundant macros (empty paragraphs, etc)
- Properly format the title
- Correct the "-*- nroff -*-" line (was a mistyped comment)
- Fix formatting issues with .IR
- Start new sentences on a new line. (This is a standard so that troff
  formats inter-sentences properly.)
Merge pull request #2 from bentley/master

Fix man page issues: