Updated links to use https

Howdy!

I just updated some links to use https instead of http.

Thanks! ^ _ ^

If we fail to get a descriptor just super the method resolving.

This should never happen, but if someone is swizzling or do other
hooking of methods, anything is possible, so this seems slighty
safer than they returning NO.

* Switch to addEnumType to fix fatal error

* Fixing more cases of HHVM incompatibility

* Updating tests to be hhvm compatible

* Fixing tests

* Fixing merge

* Don't use call_user_func, should hopefully fix tests

* Fixing spelling

* Fixing another misspelling in a test

* Fixing placement of append and kvUpdate functions

* Actually fix function helpers

* Remove double addEnumType. How did this ever work?

* Fixing a couple more tests

* Only use the setter if the return value isn't an object

* Fixed a bunch of Ruby conformance errors.

* Fixed some more Ruby conformance errors in JSON.

replenish missed header files in install step

ObjC: Document the exceptions on some of the writing apis.

Raise the number of digits used for floats.

install 'generated_message_table_driven.h' and 'metadata_lite.h', they are included when compiling the files generated using protoc.exe 3.3.0

That implementation of json is not being used - this extension is using
a json encoder/decoder provided by 'upb'.

About 1.5% of all IEEE754 single-precision numbers require nine
decimal digits to represent accurately.

Qualify string in java_options.h

bazel: add bazel symlinks to .gitignore

bazel: Make compiled jars java 6 binary compatible.

Building the protobuf compiler with Bazel fails to resolve the unqualifed "string"s in java_options.h:

```
ERROR: .../external/com_google_protobuf/BUILD:248:1: C++ compilation of rule '@com_google_protobuf//:protoc_lib' failed: Process exited with status 1 [sandboxed].
In file included from external/com_google_protobuf/src/google/protobuf/compiler/java/java_context.h:41:0,
                 from external/com_google_protobuf/src/google/protobuf/compiler/java/java_enum_field_lite.cc:38:
external/com_google_protobuf/src/google/protobuf/compiler/java/java_options.h:59:3: error: 'string' does not name a type
   string annotation_list_file;
   ^
external/com_google_protobuf/src/google/protobuf/compiler/java/java_options.h:62:3: error: 'string' does not name a type
   string output_list_file;
   ^
Use --strategy=CppCompile=standalone to disable sandboxing for the failing actions.
INFO: Elapsed time: 41.487s, Critical Path: 6.20s
//interpreter:eval_test                                               NO STATUS

Executed 0 out of 1 test: 1 was skipped.
```

See: https://github.com/bazelbuild/bazel/issues/3198

Update commit id to upload latest composer.
Compile php with bc-math for future json support.

* Follows proper autoloading standards
 - Splits PHP classes in descriptor.php into separate files
 - Splits MapFieldIter and RepeatedFieldIter into separate files
 - Moves descriptor.php to Internal/functions.php
 - Moves all namespaced functions into Iternal/functions.php

* fixes Makefile.am for added php files

* [PHP] moves all functions to GPBUtil

* removes description.php from the makefile

Add tvOS to the podspec.

Fixes https://github.com/google/protobuf/issues/3217

Export symbols used in inline functions

fixed_address_empty_string symbol is used in an inline function.
We have to export it to avoid undefined reference link errors.

Ensure that for Java, imports of .proto files with empty packages works

Add continuous testing config files for Kokoro

Add MacOS and Linux tests to Kokoro

ObjC: Preserve unknown fields in proto3 syntax files.

Refactor cc options in BUILD file for Windows

CMake: Add modern protobuf_generate

As announced: https://groups.google.com/forum/#!topic/protobuf/VX5qEmTW3y0

The ObjC side of https://github.com/google/protobuf/issues/272

Properly error on a tag with field number zero.

Fix CMake version check

* Add new file option php_namespace.

Use this option to change the namespace of php generated classes.
Default is empty. When this option is empty, the package name will be
used for determining the namespace.

* Uncomment commented tests

* Revert gdb test change

* Update csharp descriptor.

* Add test for empty php_namespace.