Improved dissertation signature page code with new macros to define advisors and their title lines.

new documentclass options: fivemembers, advisoralone, advisornotalone

new macros \advisorFive \advisorSix
\committeechair (typo fix, but old left for backwards compatibility)
\NPSsignaturefontsizenormal \NPSsignaturefontsizesmall \NPSsignaturefontsizefootnote

Example is improved to use the new macros.
Improving the readme to reference the dissertations can support 5 or 6 committee members
Merge pull request #32 from nps-lug/feature-dissertationsignaturepage

Feature dissertationsignaturepage