storage(docs): storage.bucket -> storage().bucket

Update example from docs to show:

    storage().bucket('name');

instead of:

    storage.bucket('name');
remove bucket env var req. & stop deleting all buckets

fixes #270
fixes #271
fix BQ error + retry retry logic
make error throwing more concise.
Merge pull request #275 from stephenplusplus/spp--fix-storage-tests

remove bucket env var req. & stop deleting all buckets
Add BigQuery to list of services in README
storage: set metadata on Bucket after creation
Big Query --> BigQuery
Merge pull request #277 from stephenplusplus/spp--storage-set-metadata

storage: set metadata on Bucket after creation
docs: fix links. fixes #279
Merge pull request #280 from stephenplusplus/spp--docs-link-fix

docs: fix links. fixes #279
docs: fix more links
readme: drive home the "service account" part.
Merge pull request #281 from stephenplusplus/spp--docs-link-fix

docs: fix more links
storage: use util.makeWritableStream
Merge pull request #276 from stephenplusplus/spp--storage-use-makeWritableStream

storage: use util.makeWritableStream
bq: tests: clean up what is created. fixes #282
storage: detect contentType from upload()
Merge pull request #283 from stephenplusplus/spp--bq-reg-rm-storage-buckets

bq: tests: clean up what is created. fixes #282
Merge pull request #284 from stephenplusplus/spp--storage-detect-file-type

storage: detect contentType from upload()