Removed aux, log, out, and several other temporary LaTeX files from exercises.
Added .gitignore for aux, log and other LaTeX output. And many other useless file formats.
Merge branch 'master' of github.com:miladh/fys1120

Conflicts:
	exercises/week-02/exercises-week-02.log
	exercises/week-02/tmp/exercises-week-02-answers.log
	exercises/week-02/tmp/exercises-week-02-answers.pdf
	exercises/week-02/tmp/exercises-week-02-plain.log
	exercises/week-02/tmp/exercises-week-02-plain.pdf
	exercises/week-02/tmp/exercises-week-02-solutions.log
	exercises/week-02/tmp/exercises-week-02-solutions.pdf
	exercises/week-03/tmp/exercises-week-03-answers.aux
	exercises/week-03/tmp/exercises-week-03-answers.log
	exercises/week-03/tmp/exercises-week-03-answers.pdf
	exercises/week-03/tmp/exercises-week-03-plain.aux
	exercises/week-03/tmp/exercises-week-03-plain.log
	exercises/week-03/tmp/exercises-week-03-plain.pdf
	exercises/week-03/tmp/exercises-week-03-solutions.aux
	exercises/week-03/tmp/exercises-week-03-solutions.log
	exercises/week-03/tmp/exercises-week-03-solutions.pdf