Merge pull request #14 from gdengler/master

Fehlerkorrektur von @gdengler
Merge pull request #15 from gdengler/master

discret 2D Convolution added by @gdengler
Ergänzung: Color Image Processing; Uebungen raus, according to #13
Added Titlepage
Merge branch 'DigPro1_dengler.git/master' #17  with additional corrections, resolved #16
shorter table of contents and small corrections
Typo and fixes #18
Idiotenseite eingefügt
small error
Merge branch 'master' of https://github.com/HSR-Stud/DigPro1