More informative error
release 2013.08.08
Merge pull request #1189 from cyisfor/master

More informative error
Clarify template error message (#1209)
Merge branch 'master' of github.com:rg3/youtube-dl
Invalid signature again (fixes #1215)
Merge pull request #1216 from patrickslin/patch-5

Invalid signature again (fixes #1215)
release 2013.08.08.1