Add detection of rare missing URL

Detects when a rare bug occurs in which a URL is not provided by the Twitch API for the preferred quality and plays the highest available quality.
Bug Fix

Fixed a bug where a line from Twitch API playlist response is ignored. (Also most likely the cause of the bug that looked like a missing URL in the Twitch API response)
Increment Version to 1.1.1
Increment Version to 1.1.1
updated URL check
Update README.md
rewrite saveHLSToPlaylist
Merge pull request #74 from ingwinlu/improve_playlist_generator

rewrite saveHLSToPlaylist (code speed optimization) - ingwinlu
major code optimisation
version increment to 1.1.2
added string for mobile quality option
added string for mobile quality option
added string for mobile quality option
added string for mobile quality option
added mobile quality option to settings screen
added mobile quality option
increment version to 1.1.3
version increment to 1.1.3