added binaries of GitHub-logos and added new  file 'link.tex'
added QR codes for github and btsync
Reworked the appearance of the title an added an abstract
added \semester-command
Merge branch 'master' into add_abstract

* master: (31 commits)
  added second half of today's lecture
  added first half of today's lecture
  added second half of today's lecture
  added first half of lecture
  minor fixes
  updated table of contents entry
  added today's lecture
  added second half of today's lecture
  added first half of today's lecture
  added second half of today's lecture
  added first half of today's lecture
  added rough transcript of chapter 12's remaining part
  Minor fixes on gdbgauda's changes, thx!
  Marginnote zu einfachen Gruppen, bei Def. 1.11
  Tipp"fehler" in 1.11 und 1.12
  Schönheitsänderungen im Beweis von 1.10
  Beweis/Rechnung zur Bemerkung in 1.9
  Änderung in Satz 1.9 (Frattini-Argument)
  Kleine Änderung zuum k_i im Beweis 1.8
  Kleinigkeit: Klammern im Nenner vom Beweis 1.8
  ...

Conflicts:
	Ana_Top_Geo/ana_top_geo.pdf
updated binary
fixed index entry