fix(views): allows passing base_url through gallery view

Although the pagination view choses a sensible value for base_url, devs could
pass in base_url to elgg_list_entities() for lists, but not galleries. This
remedies this inconsistency.

Fixes #7669
chore(i18n): update translations
chore(release): v1.9.7
fix(travis): Freezes PHP CodeSniffer on version 1.5.6
chore(travis): Moved PHP_CodeSniffer from pear to composer dependencies
Merge pull request #7678 from Srokap/release-1.9.7

Release 1.9.7
Merge pull request #7672 from mrclay/7669_base_url

fix(views): allows passing base_url through gallery view
chore(travis): Cleaned up .travis.yml for 1.9
Merge pull request #7686 from Srokap/travis19

chore(travis): Cleaned up .travis.yml for 1.9
Merge branch '1.9' into 1.10

Conflicts:
	.travis.yml
	composer.json
chore(readme): Bumped badges to the 1.10 branch
chore(docs): Bumped docs config to 1.10 branch
Merge pull request #7687 from Srokap/1.10

Merge branch '1.9' into 1.10
Merge branch '1.10' into 1.x
chore(docs): Bumped docs version and badges to indicate 1.x version
Merge pull request #7689 from Srokap/1.x

Merge branch '1.10' into 1.x
feature(views): Adds API for deferring the rendering of nested views

This allows a dev to collect information on what data will be needed for rendering
but defer that rendering until the data can be fetched in an efficient manner.

Fixes #6940