* replace some guava API with new Java 1.7 native API
* replace Collections.sort with List.sort(Java 1.7)
* replace annonymous inner types with lambdas
* use try-with-resources where possible
* replace explicit types with diamond operators

fix bug (when use reverse proxy with TLS, "HttpServletResponse.sendRedirect" will redirect to http rather than https)

fix bug (when use reverse proxy with TLS, "HttpServletResponse.sendRedirect" will redirect to http rather than https)

1. fix flyway migration Chinese garbled issue
2. limit hibernate query plan cache
3. fix import/export api
4. wording update for yaml/yml namespace support
5. update ldap sample configurations

enhance ldap user service to support filtering users by group

修复service-apollo-portal-server.yaml initContainers The Deployment "deployment-apollo-portal-server" is invalid:问题

add yaml support to apollo-client

1. support yaml config file transform to properties
2. support yaml config file injection to Spring

add rate limter for no app id warning log

add servlet initializer for apollo-portal and apollo-adminservice

Fix the issue 'Container type has already been specified as AND, cannot change it to OR'

allow config value to be empty. #1882

prompt current config item that is being deleted

add stargazers trending chart

add known user

fixes #1880 pagination not work