Add node and php to benchmark dashboard

* Add ruby 2.3, 2.4 and 2.5 test for linux.

* Update kokoro files

* Add back commented gc test

* Fix gc_test failure

* Remove unused code

* Update ruby 2.5.0 to 2.5.1

* Update ruby 2.3 to 2.3.8

* Remove useless comment

Removed unnecessary includes from stubs/common.h

Revert "protobuf_generate(): add relative path to output dir"

Remove unnecessary cast to Builder in generated Java code

Link to libatomic when necessary (eg. on armv6l)

Update third_party.md regarding Erlang

Removing links to Erlang projects which are no longer maintained.

remove obsolete parent

* Replace assert_true/assert_false with assert, because they are not provided in newer version of test/unit

* Use rescue to handle exception subclass

* Commented out the require that caused gc_test failure.

* Commented out test

* Fix typo

* Ported FieldMaskUtil from Java to C#

* Merged FieldMaskUtil into FieldMaskPartial

- Removed FieldMaskUtil
- Moved FieldMaskTree to root
- Updated tests

* Improved tests

- Removed internal method FieldMaskTree.GetFieldPaths
- Proof FieldMask.Paths only contains expected values

* Added FieldMaskTreeTest to Makefile

* Added FieldMaskTree to Makefile

* Add support for primitive types in setters

* Update to address PR feedback

* Add tests and fixes for repeated fields

* Remove repeated field code, add getters

* Cleanup, test getters and oneofs

* Move boxing logic into separate class

* Add tests for wrapper type constructor args

* Update to add new setXXXValue methods

* Fix tests for invalid values

* Fix c extension for wrapper accessors

* Fix the bug that well known types didn't call Message_construct

* Address PR comments

* Refactoring init message with array logic

* Add include path to protoc

* Add missing TSRM_LS defintion

* Fix TSRM_LS

* Fix dist check

* Fix parsing empty Struct Values from Json

This fixes a bug. When parsing a struct from JSON like
    struct = json_format.Parse('{"k": {}}', Struct())
then the struct's "k" value would end up not initialized, and accessing
the value would raise an error.
    In[1]: struct['k']
    ValueError: Value not set
That seems to be because the Struct field of the Value was not set.
    In[2]: struct
    Out[2]:
    fields {
      key: "k"
      value {
      }
    }

This commit makes sure that the Value's Struct field is initialized even
if the Struct has no values itself.

This commit also extends a test to cover this case.

* Additionally test for empty list

* ParseFromString returns bytes parsed

ParseFromString is documented as returning the number of bytes parsed,
and the C++ implementation does this, so the Python implementation
should too.

See #5165.

* Fix docstring

* Add a test for ParseFromString length behavior

Many classes within collections were moved to collections.abc in Python
3.3 -- their usage as imported directly from collections is now
deprecated as of Python 3.7 and will be removed soon.

The fallback import added in this PR can be removed entirely when
support for versions of Python prior to 3.3 is dropped.

* Fix dist check for ruby

* Fix dist check

Fixed unsigned warning

Use ::_close rather than ::close in Win32 stubs.

Follow ObjC conventions and how the generated header labels things by
copying NSStrings/NSData fields when setting them.

Causes a warning in newer Xcodes.

The former is the proper converse of _open, which is used in
::google::protobuf::internal::win32::open. This resolves issue #5209.

Added VSCode extension link

Added link to VSCode-Proto3 extension in Other Utilities section

This reverts commit 93f6b67e.

Protoc adds already the relative path to the output directory.
Therefore, we have to remove this again from the output directory
to prevent adding it twice.

Basic Proto2 support for Ruby gem