Added gitignore

Based on https://github.com/github/gitignore/blob/master/TeX.gitignore.
Added links to more OpenCL resources

- Linked to two introductory Youtube videos.
- Replaced old OpenCL 1.1 reference with link to registry, which
  should always contain the latest OpenCL specification.
Erklaerung, warum Aufgabe 13 nicht konvergiert
Merge pull request #5 from dbrgn/gitignore

Added gitignore
Merge pull request #6 from dbrgn/opencl-links

Added links to more OpenCL resources
Merge branch 'master' of https://github.com/AndreasFMueller/SeminarHPC
Einleitung zu Anwendungen
additional labels
mapreduce integriert
Merge branch 'master', remote-tracking branch 'upstream/master'
Fix Typos
Layout Aenderungen LaTeX-Code
textsl in Formel