[docs] Update installation docs to include Fedora

- All the instructions mentioned for CentOS/RHEL are also valid for Fedora Linux so add it.
- The package name for atlas is atlas-devel not libatlas-devel for CentOS/RHEL/Fedora so fix it.
- Add 'sudo' prefix to missing places to be consistent with the rest of the document.
- Add instructions for installing python headers in Fedora into the python support section.
- Update Linux installation section to reflect Fedora, refactor a bit.
clarify project origin
default ilsvrc solving to GPU
Merge pull request #977 from ozancaglayan/patch-1

[docs] Update installation docs to include Fedora
Explain how to fix homebrew to allow updates after editing formulae
Merge pull request #1001 from drdan14/homebrew-git-repair

  Explain how to fix homebrew to allow updates after editing formulae
[docs] Several documentation fixes

- Fix a typo and a path in MNIST tutorial
- Rework instructions about Fedora installation
Merge pull request #997 from ozancaglayn/dev

  [docs] Several documentation fixes
[docs] replace intro slides with caffe tutorial
Merge pull request #1052 from shelhamer/caffe-presentation

Caffe tutorial slides
Merge remote-tracking branch 'upstream/master'