Remove any username suffix from repository_path.

This occurs from including the suffix in the
origin url to use Github with multiple accounts.
Add shortkey tips.
Add line-number info to github_blame command.
Merge branch 'doc-update'
Amend 533cade.
Merge branch 'blame-line-number'
Use branch tracked remote instead of random
fixes github_hostnames check loop: it was using only first value
Merge branch 'hlfcoding-master'

Conflicts:
	README.md
	github.py
	github_blame.py
Merge branch 'fix-multiple-github_hostnames'
Merge branch 'use-tracked-remote'