Fixed permissions.

- Reformatted page styles to meet latest Examinations Office requirements. ...

- Changed the default font to Palatino 12pt and disabled 10pt and 11pt class
  options.
- Added times class option to support 13pt Times.
- Added fontenc, lmodern and textcomp as required packages.
- Updated documentation to reflect above changes.
- Converted all images to PDF.
- Switched build toolchain to use PDFLaTeX.