Add hack to get around the "" -> java.net.URL exception (JENKINS-18229)
Added logging of conversion error
Removed temp variable
Merge pull request #26 from milkboy/JENKINS-18229

[JENKINS-18229] Add hack to get around the "" -> java.net.URL exception 
Yup hack but no other way to fix that :-)
accept empty alternativeUrl during validation
ignore .idea
[maven-release-plugin] prepare release jira-1.37
[maven-release-plugin] prepare for next development iteration
Merge branch 'master' of https://github.com/jenkinsci/jira-plugin into upstream

Conflicts:
	src/main/java/hudson/plugins/jira/JiraProjectProperty.java
	src/main/java/hudson/plugins/jira/JiraSite.java