Adding Bigtable Cell class.

[dhermes]

Used to hold data in rows retrieved.

@tseaver This module could definitely use some design review (none of the content here yet, but worth discussing now or at least thinking about).

Right now, the implementation is as follows:

• Rows are read from a Table (and a Cell is like a "column" in a row, so there can be many), so the helpers needed to parse a row that was read are in row_data.py
• Mutations (in rows) are created directly on a Row, and this is all done in row.py (all code submitted or merged)

[tseaver]

Travis failed on the docs build:

Found undocumented public modules:

- gcloud.bigtable.row_data

ERROR: InvocationError: '/home/travis/build/GoogleCloudPlatform/gcloud-python/.tox/docs/bin/python /home/travis/build/GoogleCloudPlatform/gcloud-python/scripts/verify_included_modules.py'

[tseaver]

No explicit tests for the Cell class' methods?

[dhermes]

Double fail. Sorry, forgot to stage it. Must've been in a hurry.

[dhermes]

@tseaver PTAL.

Still would like to know what you think about having row.py and row_data.py separately.

[tseaver]

Still would like to know what you think about having row.py and row_data.py separately.

My only quibble is with the filename: given that the module just contains the Cell class, ISTM that it would most logically be named gcloud.bigtable.cell.

[dhermes]

Cell is just the beginning:
https://github.com/dhermes/gcloud-python-bigtable/blob/master/gcloud_bigtable/row_data.py

[tseaver]

Cell is just the beginning:

SGTM

[dhermes]

And the content of this commit?

[tseaver]

Fine to merge.