fix bug reporting
fix link in README
fix Contribution

remove Bugzilla, use Issues instead
add template of a successful bug report
fix installation and set dev env

remove fedorahosted related things

Conflicts:
	docs/source/installing_in_rhel.rst
	docs/source/set_dev_env.rst
Merge pull request #27 from tkdchen/fix-docs

Fix some pieces of documentation