update readme
:construction_worker: logging module: deactivate sending of mails

fixes #137
:floppy_disk: check for SimpleXML availability

fixes #108
:bulb: Got it! Add some episode-validity checks in validating module

fixes #107
fixes #137
:shipit: release 1.7.1-alpha
:fix: Feed web player with existing/valid files only
:bug: Downloads work without JavaScript enabled
remove ./vendor/ from version control
:children_crossing: episode previews should work now

fixes #103
update composer dependencies
fix tests
update readme with development hints
update rake cloc task
Migration: you are now able to import file slugs containing dots :bug:
Fix podlove_alternate_url issue :bug:

fixes #142
pwp update to 2.0.13
Merge pull request #147 from SimonWaldherr/pwp-update

pwp update to 2.0.13
add web player update to readme
release 1.7.2-alpha :shipit:
pull updates from master