Adds Email/Username placehold to registration form
Merge pull request #208 from mskarbek/master

mskarbek contributed Twitch support, thanks!
Merge pull request #204 from silent1mezzo/master

Added placeholders to registration form
UnicodeEncodeError in subject (closes #209)
Dropbox support init
Added Dropbox support (closes #200)
Added Dropbox to feature list