fixed index entry
updated binary files
Merge branch 'add_abstract'

* add_abstract:
  deleted unnecessary links.tex file
added generic abstract text
added \homepage command and include the new abstract text
restored compatibility with pdfTeX
minor visual enhancements
added today's lecture
minor fixes
minor fix to a table of contents entry
fixed another table of contents entry
updated readme:  added advice on how to compile the files with XeLaTeX, especially mentioned the fonts used
visual fixes
minor visual fix
added first half of today's lecture
added second half of today's lecture
added yesterday's lecture
added today's lecture
minor visual enhancements, note on missing part at the end of chapter 3 added
fix cd  in 10.8