Fixes https://github.com/google/protobuf/issues/1189

Remove accidentally restored deleted files.

Fix the std::string error introduced in integration.

updated README

Updated README.md

Added relative link to cmake guide.

Allow custom type URL prefixes in Any.Pack

Fix bug with silent message corruption in LITE_RUNTIME.

Properly generating well known proto files for the macos build.

Added framework for generating/consuming benchmarking data sets.

Few tweaks to the rakefile to permit native gems compilation with the proto files generation.

Merge Google internal changes

Fix cp -r usage to be portable.

cp -r foo/ bar/ in linux will create a bar/foo directoy. In the
objectivec generate descritpor case, well known types will be created in
objectivec/google/google/protobuf/.. if the command is run under linux.

Adding the trailing period fixes the behavior inconsistency.

(And likewise ignore the prefix in unpack.)

Fixes issue #1459.

Added dig and bsearch_index to RepeatedField methods forwarded to array

This takes the code that was sitting in benchmarks/
already and makes it easier for language-specific
benchmarks to consume.  Future PRs will enhance this
so that the language-specific benchmarks can report
metrics back that will be tracked over time in PerfKit.

Fix up -hash/-isEqual: for bool storage.

Both methods weren't checking the has_bits (where the bools are stored), so
it resulted in invalid results.

Add a test that should shake out something like this in the future also.

This fixes the test_acts_likes_an_array test in RepeatedFieldTest, which
checks that repeated fields respond to the same methods as regular Ruby
arrays. The bsearch_index and dig array methods seem to be new in Ruby
2.3 and so we should support those.

Updated upb and simplified ruby code a bit with new upb method.