Compile the Java proto runtime with Java 6

in order to avoid errors related to generics when 
building user code in newer versions of Java.

migrate delimited messages functions to util package

Remove duplicated copyright statement

fix attributes warning

Ruby: only link against specific version of memcpy if we're using glibc

Add preserve_proto_field_names option to JsonPrintOptions

We have some special code in wrap_memcpy.c to ensure that we use the
2.2.5 version of memcpy, for compatibility with older versions of glibc.
However, we need to make sure we only attempt to do this when we are
actually building with glibc, so that the code can also build
successfully against other libc implementations such as musl.

DefaultValueObjectWriter should populate oneof message field

This option will be prepended to generated classes of all messages in
the containing file.

Fix freebsd build.

Add a notice for nano.

We no longer supports nano and recommend protobuf lite over nano for
Android users.

Changed scope of Java deps to "test".

Ruby: fixed Message#to_h for map fields.

JS: ensure that extension values are serialized even if they're falsy

This is per: https://github.com/google/protobuf/issues/2019

compiler/cli: PrintHelpText prints to stdout instead of stderr

Unfortunate typo. Just one extra ',' symbol, has led to the hidden implicit behavior.

Now everything will be fine.

in order to be wire compatible.

Hide unnecessary exported library symbols

Updated an outdated comment in bytestream.h

Document deep copy in the header

It turns out system headers included by generated plugin.pb.h file already contains
major/minor macro definitions when built on FreeBSD and we need to add #undefs to
the generated header file.

This change also fixes another compile error regarding EXPECT_DEATH on FreeBSD.