2336: filter tasks properly when building language lists
2344: hack get_subtitle_version to exclude sources

Check the comment in the code for more information.
2337: check for empty language list properly
some additional tests for joining teams and invites
Merge pull request #160 from jdragojevic/wd-invites

some additional tests for joining teams and invites
Merge branch 'i-2337' into staging
Merge branch 'i-2336' into staging
Pinning python-memcached to the previous version (through a specific github commit) cause the latest pypy package is broken, and the maintainers *delete* the old packages.
Fixed lingering line on requirements.txt
Merge branch 'i-2344' into staging
updated test for when no primary audio lang set
Merge pull request #161 from jdragojevic/wd-i2337

updated test for when no primary audio lang set
just a few test updates
Merge pull request #164 from jdragojevic/wd-updates-5

just a few test updates
still want this test to pass on jenkins
Merge pull request #165 from jdragojevic/wd-updates-6

still want this test to pass on jenkins
2352: Include bold style so that formated subs can be previewed
Merge branch 'staging' into dev