Added alias getFieldProto3 as used by older generated code.

Un-breaks users who have old generated code and upgrade
to the 3.1.0 release.

Update README.md

Fix VS test failures.

Needed to pick up a Java dependency change and re-populate the offline
repo.

[skip ci]

Reduce test length to avoid stack overflow on VS.

"ps: StartFileDownload" is broken by a recent appveyor image update:
http://help.appveyor.com/discussions/problems/5308-ci-frequently-hangs-with-recent-image-update

Change-Id: Ia73aa8b12f77eb9bbec556a4c05310153aad97bf

Fix Visual Studio compile issues.

Change-Id: I6a5078b6bcdf4637e11c1cb9da1f74298e6fc26e

Fix default instance destructor and memory leaks

* PHP: support 7.0

* Also fix in test_util.php

[skip ci]

Change-Id: I1ba6f6372a08b5796570851336e1a548602f60da

Change-Id: I3ff47358e66965cab34736eed2a477ae29f02f61

`System.identityHashCode` returns a hash that does not consider a
Message's values. This means two Messages with identical values will not
have identical hashCodes.

This patch uses the pattern from RubyMap to combine the hashCodes from
all values in a given message and produce a unique, consistent,
value-based hash.

This is necessary so that the CMake build knows to include this header
file in the installation include/ directory.

Currently deserialization of a non-packed binary repeated field is quadratic in
the number of elements, because each time we parse a new element we copy over
all elements we have parsed so far. This CL fixes the performance problem by
having the generated deserialization code just call addX() instead of using
getX() and setX().