Update emojis.json

add "night" in sleeping
Remove trailing whitespace
Use single quote for string includes double-quotes
Remove unnecessary escapes in regular expressions
Update emojis.json

My coding level is not good... Sorry.
Merge pull request #81 from yous/patch-quote

Clean up strings
Merge pull request #80 from yous/patch-trailing-whitespace

Remove trailing whitespace
Merge pull request #79 from Denon/patch-1

Update emojis.json