Fixing typo.
Allowing Fixnum as input fro describe method.
Initializing the options[:issue] field with nil.
Making git-jira == git-jira list

Improving help and adding copyright notice.
Returning status code 0 if all ok, 1 if minor problem and 2 if serious problem.
Adding `config` command that outputs the current host and project_key.
Showing JIRA username in JIRA Host...........:
JIRA Project Key....:
JIRA Username.......:  output
Adding JIRA Host...........:
JIRA Project Key....:
JIRA Username.......:  command to the README.md
Fixing return values.
Improving output if not suitable branch was found.
Pushing version to 0.3.0.
Adding shortcut binary 'gj'.
Adding shortcut 'gj' to the README.md examples.
Adding the shortcut command as alternative to the help.
Reformulating warning message.