Fix mistakes and syntax error in example

Also use SQLite so new users can more easily copy and paste and try it out right away
Fixes #488
fix _absoluteConfigDir to support both absolute and relative paths
fix off-by-one error in sqlite insertChunked
Allow jsonb columns to be created with the schema builder

Closes #499
join columns now optional. Fixes #504
Merge pull request #508 from vschoettke/join-without-column-specification

join columns specification now optional. Fixes #504
Clarify migration setup on #initialize

Closes #507
Document extension option for migration API
Merge pull request #500 from tgriesser/jsonb

Allow jsonb columns to be created with the schema builder
Merge pull request #495 from jut-io/fix-sqlite-insert-chunked

fix off-by-one error in sqlite insertChunked
Merge pull request #494 from jut-io/fix-migrate-absolute-paths

migration config support both absolute and relative paths
implement support for postgres create/drop schema
Merge pull request #511 from tkellen/schemas

implement support for postgres create/drop schema
Consistent handling of 'not' cases similar to 'or'
Handle empty array case for whereIn, fix #477
Add where(bool) test
Support both array and variable arg key syntax, #485
Bumping dependencies, adding changelog
release 0.7.0
Better error handling for disconnects & pool, fix #452