Refactor Travis settings

This reverts commit af3756ce35dee3bb76ddd22fd27d18f05ee5db78.

NOTE: this is one-off change that would be reverted once I verify
that Travis does pick up the s...

Add mention to ROM and Sequel in Repositories guide

Mention PostgreSQL types in Migration data types page

It should be "take care of keeping" instead of "take care of keep".

Fix share code page in Views guide

Require relative is not pointing at the correct path.

Blogpost documentation challenge

Add information about creating batch records

Fix incorrect usage in guides/actions/control_flow

Add validations guide

Update Routing helpers in guides

Mention again how absolute URLs are generated: using scheme, host and port settings

Update link to migration generator

Make sure link arrives directly at the "migrations" anchor

Use rspec instead minitest in mailer guides

Fix selected dropdown guides page responsive site, Issue #367

Fix erb example in escape page

Add custom logger example

This adds a custom logger example demonstrating the use of a custom logger.

Add documentation for the hanami new --template option.

Set 1.0 version default for guides

Update entities.md

Typo :)

Separate guides for each version

Add breadcrumbs to guides

Add missing example with option args

Make retrieving articles a little bit faster

It had code snippet from pre 1.0

Structural improvements to overview.md

Improve views shared code guide.

Added selection of `foreign key` and remove '#' in column

Update shared view guide

Update validation overview.md

It makes more sense for *Rack* description to be before *Actions*.

Fix formatting for 'hanami routes' command output

add description for fields_for_collection

Update getting started guide

Removed extra 'it' from test description and removed outdated
reference to hardcoded error messages