Added various c++ test projects that run under GCE virtual machines. Demonstrates a few
concepts.

1. How to compile and run (I chose cmake for build system)
2. How to link in a library (I demonstrate with gflags)
3. How to stream a file from gs:// to a c++ binary
4. How to write a stream from a c++ bnary to a gs:// bucket.

To build:

cd src_cc
mkdir build && cd build
cmake
make

To run:
You'll find binaries for the various test projects under src_cc/build/<project_name>

To copy files from a virtual instance to your local drive:
gcloud compute copy-files tvykruta-micro:~/src .

(replace tvykruta-micro with your instance name / hostname)

To copy sources from your local drive to the virtual machine:
gcloud compute copy-files . tvykruta-micro:~/src