Get all tests passing on Python3 (except Python3.4 cpp implementation)

vsproject files no longer exist.

Update version number.

Update README.md for C#

Protoc, C++ runtime and Java runtime are updated to v3.0.0-beta-1, other
languages are updated to v3.0.0-alpha-4.

Assume LITTLE_ENDIAN for windows build

Remove an unused typedef.

Fix JSON map fields parsing.

add static cast to silence signedness comparison warning

Fix cmake build on linux.

Backport: Change where we rename Descriptor.cs to DescriptorProtoFile.cs.

Include descriptor.proto in nuget package

include descriptor.proto in nuget package 

Fix compile issues with -std=c++11

This compiles with -std=c++11:
message Foo {
  map<string, Foo> value = 1;
}

This does not compile:
message Foo {
  map<int32, Foo> value = 1;
}

Needs to dig more into the underlying issue.

fix "memory leaks" in protostream-object files.

Change-Id: I0aca56802d974cb03cb89c1a294f37068b5b9758

Fix commandline interface file under heapcheck.

The internal down-integrate script probably does not handle the
top level macros well. Moved the macro inside of the namespace
declrations to avoid down-integrate errors in the future.

Change-Id: I3790357f36b0204a2a26577805192a3a1e989df8

Define GOOGLE_ATTRIBUTE_NOINLINE for MSVC. Workaround for VS2015 Release build compiler bug

We now do this in protoc instead of the generation simpler.

Benefits:
- Generation script is simpler
- Detection is simpler as we now only need to care about one filename
- The embedded descriptor knows itself as "google/protobuf/descriptor.proto" avoiding dependency issues

This PR also makes the "invalid dependency" exception clearer in terms of expected and actual dependencies.

Fix bugs on windows

Update cmake and BUILD files.

Change-Id: I17e16fdae6e4d2fb74d178fa5564a609ed58af1d

Change-Id: I74a73d3135ec1e0e4d52d741a77456b8e55f038f

Change-Id: I83a93fdb119a643fbc884e6ec3624493f6270370