Added instructions on what tools to install to compile protobuf from
source. Removed the INSTALL.txt file because it's just a simple copy of
the autoconf documentation and confuses users.

Change-Id: I6fd8aa13495f1238fe5c62451b95ad480b1c4bed

Defer calls to mutable_unknown_fields() until it is actually required to
save memory for C++ lite runtime.

Change-Id: Ica9c1fd276cdb164942d1e7b6e098c83ee3ffdc5

Update version number and fix javadoc errors.

Fix up the conformance tests

- Update all the new runner cases to handle a skip result as a skip and not a failure.
- Make ObjC use the new serialize_error result if it fails to generate the data.

Update objectivec/google/protobuf/Type.pbobjc.m

commit e841bac4 seems to have updated the
generated .pbobjc.h but not the .pbobjc.m to match.

Fix conformance test to only report skips in verbose mode.

commit e841bac4 seems to have mis-merged the
change to reporting skipped tests.

I didn't check if there were other merge issues.

Have the tests rely on the autocreator behaviors.

Incase developers look at the tests for examples, have them rely on the
autocreators also.

Fix C# source generation shell script and remove out of date notes

The conformance tests now use types which are part of src/google/protobuf, so we need to include src in the proto path.
The notes around "fix-ups" have been out of date for some time now.

Fixes for Python 3.

[skip ci]

Change-Id: Id383944dd3c999ad1008345ef34c9bdae24abc7c

We use six sub-modules that aren't available in old versions. Not specifying
this requirement in the setup will lead to much less readable runtime errors.
It's particuarlly problematic for Mac OSX users because the system comes with
an old six version 1.4.1 by default.

[skip ci]

Change-Id: I6fa9f1b65d6c06b891aabf3f3d868364d74d727d

Change-Id: Ife609e073bd142d328b680c753f543bb18f4f66d

Change-Id: I1ee87c49481bcc545939745ccf0a53d766a01a4c

Change-Id: I4c4e2a4a248e4336fef735f75ff5648d8d33627e

Also delete some unused files.

Enabled JavaScript tests and added README.md.

The testee program crashes on some inputs.

Change-Id: Iab27b80e29b7a56c5bd7cb4724531ecf9bb2823a

Change-Id: Ia9e2795b1ff1abb30410ffb3ef96ba6f46dd99d0

The testee program of these two languages crashes on some test input.

Version number for beta languages is updated to v3.0.0-beta-2.
Version number for alpha languages is updated to v3.0.0-alpha-5.

The Java conformance test class uses JDK7+ only syntaxes and can't compile with JDK6.

[skip ci]

[skip ci]

[skip ci]

Fix static non-pod type problem with dlopen