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.
```