update travis to use develop branch
update api URLs
extend the error message on empty episodes list
cut the episodes list AFTER all played episodes got removed
extend artime api cache
record vcr cassetes with new airtime urls
fix #96
add rspec test to test #96
add changelog
travis should build ALL branches that are public
Merge branch 'hotfix/2.0.1' into develop

Conflicts:
	.travis.yml
	Changelog.md
	app/helpers/stream_helper.rb
	config/environments/test.rb
	spec/vcr_cassettes/hoersuppe-api.yml
	spec/vcr_cassettes/listeners-culture.yml
	spec/vcr_cassettes/listeners-mix.yml
	spec/vcr_cassettes/listeners-technique.yml
	spec/vcr_cassettes/listeners-total.yml
	spec/vcr_cassettes/mix-airtime-default.yml
	spec/vcr_cassettes/mix-airtime-empty-episodes-list.yml
	spec/vcr_cassettes/mix-airtime-no-live-episode.yml
	spec/vcr_cassettes/mix-airtime.yml
	spec/vcr_cassettes/stream-culture.yml
	spec/vcr_cassettes/stream-mix.yml
	spec/vcr_cassettes/stream-technique.yml
update rspec tests
fix error from merge. only display first count episodes