Update guava

Update gson

Update version in README

This changes to_time to use Ruby's built in Time.at with nanos support
rather than calculating a float and passing it to Time.at. The new
version runs about 3 times faster than the original version and
allocates fewer objects.

Warming up --------------------------------------
    protobuf#to_time    57.296k i/100ms
      faster#to_time   133.229k i/100ms
Calculating -------------------------------------
    protobuf#to_time    635.361k (± 2.1%) i/s -      3.209M in   5.052169s
      faster#to_time      1.873M (± 3.3%) i/s -      9.459M in   5.055169s

Comparison:
      faster#to_time:  1873368.8 i/s
    protobuf#to_time:   635361.4 i/s - 2.95x  slower

Calculating -------------------------------------
    protobuf#to_time   326.000  memsize (   126.000  retained)
                         7.000  objects (     2.000  retained)
                         0.000  strings (     0.000  retained)
      faster#to_time    86.000  memsize (     0.000  retained)
                         1.000  objects (     0.000  retained)
                         0.000  strings (     0.000  retained)

Comparison:
      faster#to_time:         86 allocated
    protobuf#to_time:        326 allocated - 3.79x more

fix dart example readme typo

allow copy and paste from readme

Use proto_library in proto_lang_toolchain.blacklisted_protos

to 3.8.0

spare people the time deleting $ from text.

Signed-off-by: Asra Ali <asraa@google.com>

Support for using proto_library in this attribute was added in:
https://github.com/bazelbuild/bazel/commit/a5ee2c4d979441e663cf53b2ace4daa05e5033d8

Legacy support for using .proto files will be removed in a future
version of Bazel.

* adding mvn install with snapshot version

* Added linkage monitor

* comment

* space

* Added comment

* Maven to use $HOME/.m2

* setting MVN

Setting up JDK8 for Kokoro jobs

Fix javadoc warnings in generated files

Down integrate to GitHub

Fix scope resolution for Google namespace

Merge 3.9.x into master

Merge master into 3.9.x

This should fix issue #6186. I also had to remove a couple unnecessary
const keywords in map_util.h because the no_warning_test was showing
errors about those.

Conflicts:
	java/lite/pom.xml
	java/util/pom.xml