Block streaming, mandatory persistent cache data to storage then clean the cache data.

fix Typos

* fix #1274

* #1263

Separated TTL from minute to minute, hour, day, month.

* 1. Minute metric data ttl change to 90, because of the 1 hour duration condition in UI means 60 minutes.
And i prefer to setting the value up to above 50%.
2. Some description and logging.

#1263

* Add a config time named traceDataTTL for trace data TTL.

#1263

* Fixed the logger english sentence mistake.

Update and nail org.apache.skywalking/apm-checkstyle version to a release version, 5.0.0-beta for now. (#1270)

* To bring forward a way to solve Import-Project-Eclipse-RequireItems-Exception

* way to solve Import-Project-Eclipse-RequireItems-Exception

* To bring forward a way to solve Import-Project-Eclipse-RequireItems-Exception

* Required items could not be found, when import project into Eclipse.

* using markdown style to quote the errors.

* provides a optional-plugin for tracking ignores enhancement(#1203)

* trace ignore plugin config support override by system.env

* optimize the trace ignore plugin and make normalization of pom

* add AntPathMatcher and an junit test for it

* No longer rely on the spring framework

* add license at file header

* rebuild pom and rewrite README

* rebuild optional-plugins pom

* clean up useless code

* modify junit

* rewrite the ant path match logic

* rename the matcher class

* add the trace ignore plugin introduce doc to incubating features menu.

* modify the README doc.

* remove Chinese in English doc.

* remove superfluous content of EN-doc.

* Update README.md

* Fixing #1231. Adding order and status to trace query.

* Fixing 1231. Using enum for traceState and queryOrder

* Incorporating code review suggestions

* provides a optional-plugin for tracking ignores enhancement(#1203)

* trace ignore plugin config support override by system.env

* optimize the trace ignore plugin and make normalization of pom

* add AntPathMatcher and an junit test for it

* No longer rely on the spring framework

* add license at file header

* rebuild pom and rewrite README

* rebuild optional-plugins pom

* clean up useless code

* modify junit

* rewrite the ant path match logic

* rename the matcher class

Add folder lock to collector's buffer folder.

* Adjust release doc and script based on last release vote.

* Update UI declaimer file.

* Update create_source_release.sh

* Update How-to-release.md

* rewrite http-async-client

* add unit test and document

* fix check style issue

* update test

* update doc fix ci

* fix review

fix wrong description for chinese document

* Change the buired point of block call way

* Support future way and change the operation name of span

* New english readme.

* New chinese readme.

* update faq doc

* update faq

* update faq

* Update UI licenses for beta version

Fix a format issue.

* Update CHANGES.md