[videobam] Add support for videobam.com (Closes #2411)
[f4m] Clean up
Fix imports
[videobam] Set age_limit to 18

From [their ToS](http://videobam.com/terms): "User must be eighteen 18[sic] years of age or older to use or access this web site."
release 2014.02.22.1
[vine] Fix uploader extraction
[breakcom] Fix info json extraction
[breakcom] Fix error when calling _search_regex

I passed `’webpage’` instead of the variable `webpage`.
Add one more format to unified_strdate
[vine] Extract more metadata and support low format