License comment in all source files
Use QStringLiteral for urlSchemeToEndpoints map
Add oembed providers: GitHub, Kickstarter, Vimeo
Improved performance of Provider::createForUrl()

Before:
0.9284 msecs per iteration (total: 9,285, iterations: 10000)

After:
0.0439 msecs per iteration (total: 440, iterations: 10000)
Support for format option

Add support for format option to Request class
Extend unit test RequestTest