Get Project key from Jira

[sungbin]

usage: '-k' with 'j'

./BugPatchCollector -i https://github.com/apache/zookeeper -o /your/directory -k ZOOKEEPER -j issues.apache.org

example 1

https://issues.apache.org/jira/browse/ZOOKEEPER-3007?jql=issuetype%20%3D%20Bug%20AND%20status%20%3D%20Resolved

Project Key: ZOOKEEPER

example 2

https://jira.mongodb.org/browse/JAVA-3213?jql=project%20%3D%20JAVA%20AND%20resolution%20%3D%20Unresolved%20ORDER%20BY%20priority%20ASC%2C%20updated%20DESC

Project Key: JAVA