Add COPY command support for Parquet and ORC

[dargueta]

Closes #151

• Allow choosing Parquet and ORC as load formats (see here).
• Allow choosing fixed_width as a load format as well for consistency with the others. Enforce the presence of the field widths argument if Formats.fixed_width is selected.

Todos

• MIT compatible
• Tests
• Documentation
• Updated CHANGES.rst

[dargueta]

@graingert or @jklukas you look like the main contributors here. Sorry to be a pain but I just wanted to make sure someone saw this. Thanks!

[graingert]

Hey there, can you split your Travis/tox changes into another PR, thanks!

[dargueta]

can you split your Travis/tox changes into another PR, thanks!

Done!

[graingert]

LGTM, can you clean up your commits with git rebase?

[dargueta]

There was a bug in one of my tests I had to fix after your LGTM. Do you mean I should squash the commits, or do git rebase origin/master?

Edit: For some reason I'm suddenly getting this:

dargueta@tux ~/dev/sqlalchemy-redshift (copy-parquet)*$ git fetch upstream
dargueta@tux ~/dev/sqlalchemy-redshift (copy-parquet)*$ git fetch origin
dargueta@tux ~/dev/sqlalchemy-redshift (copy-parquet)*$ git checkout master
error: pathspec 'master' did not match any file(s) known to git.

This wasn't an issue earlier today, and now I can't rebase off of master with this. Ideas?

[graingert]

@dargueta I think you want git pull --rebase=interactive upstream master

[dargueta]

Okay, cleaned them up now.

[dargueta]

I think I've got everything fixed. Any other thoughts?

[dargueta]

*bump*

[jklukas]

lgtm!

[jklukas]

Released in https://pypi.org/project/sqlalchemy-redshift/0.7.2/