add utility handler in chart controller to support getting charts by ns
add ut case for utility handler
update deletable checking logic in project controller
refactor project deletable test case
refill the multipart form data at harbor API layer
export write error functions from the chartserver package
refactor the error format to be compatiable with push plugin
append chart server related config options to the supporting list of adminserver
provide chart server related config access method in the API layer
update prepare script and ui env template file to enable cache driver config for chart server API
append flag info in the systeminfo API to indicate if chart server is deployed with Harbor
refactor the response rewriting logic to return structual error object
add api init method to initilizing objects required in API handlers
chage owner of the storage folder
update offline/online package scripts in Harbor-Util.robot
add /chartrepo after /api
add /chartrepo before /index.yaml,/:repo/index.yaml and /:repo/charts/:filename
add debug messages to the potential debug points
add more supporting mime types "multipart/form-data", "application/octet-stream" to the API endpoints
update travis file to inject ENV for UT cases of chart repo
add chart repo API controller
update GetChartVersion to extract repo name from the request
update the corresponding UI cases
update the chart controller initialization process
pass cache config to the constructor of chart cache
use break loop to instead of return in GetIndexYaml
fix typo reids to redis
pass credential to the reverse proxy and chart client via constructors
add UT cases for cache
add UT cases for ChartOperator
add UT cases for the main API service of chart server
export some consts in the security.go of filter package to let them visible in chartserver package
getting chart list returns chart list instead of map and provides total versions info
getting chart details will return dependencies and values besides the metatdata of the chart version
add chartserver directory to put chart server code
add controller to coordinate the flow
add base/repo/manipulation handlers to handle requests
add operator to parse more details of chart version
call dep ensure
