Add 'url' command.

This will allow devs to quickly browse the pull request by using the url
command.

This command will simply grab the pull request url for the current
branch or the specified one.
Add command to helper functions.
Change error message for pull not found.
Fix private repos issues.

Now, it uses authentication to access private repo pulls.
Typo fix: "requeset" => "request"
Remove rescue statement.

I haven't found a testcase that will even reach this statement.
Require arguments.
Merge branch 'master' into url-command
Add completion.
name-of-feature -> name-of-hotfix

This helper method correlates to the hotfix commands so it should be
'name-of-hotfix' rather than 'name-of-feature'.
lib/github.rb: Avoid NoMethodError exception.

Return pull && pull[:html_url] and check if 'url' is true rather than
using an exception to check if a URL is found.
Merge branch 'master' into url-command

Conflicts:
	completion/_feature
	completion/_hotfix
	completion/bash_completion.sh
	lib/github.rb
Merge url-command (#93) into master

Add 'url' command.

This will allow devs to quickly browse the pull request by using the url
command.

This command will print out the pull request url for either a hotfix or feature branch.

Conflicts:
	man/feature.1
	man/hotfix.1