travis: try larger build matrix
travis: more WP versions
travis: fix version grep
travis: fix version grep
travis: try some older WP versions
Revert "travis: try some older WP versions"

This reverts commit 66d9c966e708adc74593a169e4b2a4aff6520b08.
apply WP coding standard, as tested by phpcs
some more code formatting, also add FF_Meta_Externaldata as service to FF_Dir and FF_Meta
use composer to fetch testing tools
ignore projects files and composer install
add Behat tests
rewrite unit tests (for wordcamp)
small output bugfixes
need no vendors for testing
no more tests on WP 3.7, uses deprecated mysql extension
add a simple "ff_list" shortcode, refactor get_all_locations()
Merge branch 'testing'
bump version