Merge branch 'release/0.9.0' into develop
support backlog.getCustomFields
remove debug log
fix backlog.getCustomFields test
add .npmignore
expect.js -> chai
support promise & refactoring test
add example "list_projects.js"
update .npmignore
fix local validation
support backlog.updateIssue
support backlog.switchStatus
support backlog.addComment
support backlog.addIssueType
support backlog.updateIssueType
support backlog.deleteIssueType & add examples
support backlog.addVersion
support backlog.deleteVersion
support backlog.updateVersion & add examples
improve examples/issue_type_crud