Merge pull request #6 from runmad/master

Return lower quality instead of error if desired quality doesn't exist
Fix sample app
fix precision conversion warning

This silents the warning
```
YTVimeoExtractor/YTVimeoExtractor/YTVimeoExtractor.m:110:92: Implicit conversion loses integer precision: 'long long' to 'NSUInteger' (aka 'unsigned int')
```

on xcode 5
Merge pull request #7 from sbl/patch-1

fix precision conversion warning
remove /v2/ URL part due private API change
podspec copy
Remove temp podspec
Merge pull request #12 from modnovolyk/url_v2_fix

remove /v2/ URL part due private API change