Initial version of Metabase database manager

[wvengen]

This is a bit of a different database manager, using Metabase's REST API.

Limitations:

• Supports native queries only (good for SQL).
• Autocomplete doesn't make much sense for non-SQL databases.
• Tested with admin access only (but should function with normal access too).
• Queries cannot be cancelled because fetch doesn't support it.
• Error handling could be improved in some places (but I consider it good enough for now).

When loading table info, only the current selected database is cached - to avoid huge installations blowing up Atom memory use.

Remaining issues:

• report errors to user (now Uncaught TypeError: this.state.message.split is not a function #65 is happening when a promise is rejected)

[lukemurray]

Interesting. I'll have a look at this this weekend and try to merge it. Thanks!

[morenoh149]

bump for interest

[teamgroove]

OMG - a conflict in the README.md prevents the code-merge. Tragic.