Add init optionality

[wzrdtales]

Current behavior

If db-migrate tries to connect to a database that does not yet exists it is going to throw an error. The user needs to create the database with fitting permissions first.

Proposed solution

Add a command line option --init which tells db-migrate to first check if the database exists and then tries to execute a database execution. This tasks has items listed below.

Affected drivers

All: New method showDatabases is needed

Items:

• Add showDatabase method pg#6
• Add showDatabase method mysql#2
• Add showDatabase method db-migrate-base#2

API extensions

• New command line option

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