convert_imageset now uses gflags; optional arguments can be positioned
arbitrarily now
Handles gflags's change of namespace
Fix lint errors
Reordering of header includes for convert_imageset.cpp
Use gflags to show help when the arguments not correct
fix layer_factory.cpp bug: there should be no ifdefs
Merge pull request #993 from Yangqing/sweep

fix layer_factory.cpp bug: there should be no ifdefs
create_imagenet.sh updated to new syntax
Merge pull request #857 from netheril96/gflags

Use gflags to parse command line arguments for convert_imageset
clarify project origin
[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.