handled not working sortBy issue
added response builder to utils
refactored authenticate/logout & controllers/ref_api_router.jag responses and error handling
response refactoring/error handling at defaults/apis/assets.jag
response-refactoring/error-handling at asset_api.js
added filtering URL paths to apis/assets.jag
improved field expansion
lifecycle api skelton added
Merge pull request #119 from ayshsandu/1.2.0-m3

Publisher Rest API improvements
Merge branch '1.2.0-m3' of https://github.com/wso2/enterprise-store into 1.2.0-m3
handled not working sortBy issue
added response builder to utils
refactored authenticate/logout & controllers/ref_api_router.jag responses and error handling
response refactoring/error handling at defaults/apis/assets.jag
response-refactoring/error-handling at asset_api.js
added filtering URL paths to apis/assets.jag
improved field expansion
lifecycle api skelton added
Fixed conflict