Remove cyclic import from ignored for tests.
Reducing repeated pylint configs by defining test configs as a delta.

Uses ConfigParser to append modifications onto base file and
writes a new config file (which is gitignore-ed) before running
pylint.
Putting pylint additions for tests into run_pylint.
Implementing remaining datastore regression tests from gcloud-node.
Merge pull request #302 from dhermes/remove-cyclic-twice

Remove cyclic import from ignored for tests.
Uses pre-built wheels when pip installing from tox.

In addition:
- Creates script scripts/update_wheels_project.sh to kick off a new
  build when merging to master (outside of a PR).
- Moves update_docs into a larger group of merge scripts
  that happen when merging to master.
Merge pull request #307 from dhermes/finish-datastore-regression

Implementing remaining datastore regression tests from gcloud-node.
Merge pull request #308 from dhermes/speed-up-build-stage-two

Uses pre-built wheels when pip installing from tox.
Adding LATEST_COMMIT file with correct relative path.

Fixes error introduced in #308.
Removing skip travis from commit msg so wheelhouse rebuilds occur.

Also removing an out-of-date comment.
Updating CONTRIBUTING to describe build optimizations.
Speeding up lint by only considering files which are different.

H/T to @sk- and https://github.com/sk-/git-lint for the
inspiration.
Removing current value of EXTRA_TOX_ENVs from CONTRIBUTING.

Also changed the Travis settings in gcloud-python-wheels to
make this value visible so people can continue to maintain it.
storage: update api version
Merge pull request #317 from silvolu/fix-storage-api-version

storage: update api version
Merge pull request #316 from dhermes/speed-up-lint

Speeding up lint by only considering files which are different.
Fix Copyright example in LICENSE
Merge pull request #309 from dhermes/wheels-tweak-and-docs

Wheels tweak and docs
Normalize away extra empty line after method docstring.
Merge remote-tracking branch 'upstream/master'