fixing https://wso2.org/jira/browse/STORE-50
Rename books to ebooks
Merge branch 'master' of https://github.com/wso2/enterprise-store
fixing https://wso2.org/jira/browse/STORE-47
Merge branch 'master' of https://github.com/wso2/enterprise-store
fixing https://wso2.org/jira/browse/STORE-47
Merge remote-tracking branch 'upstream/master'