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dgt authored
switch to utf8mb4 which can store all unicode code points including emoticons (utf8 which we used before is an alias for utf8mb3 which only stores a maximum of three bytes). the rake task cg:convert_to_unicode converts the database into utf8mb4. it also sets a binary collation for our tags table, because we want to distinguish between olé and ole. there is no test for this feature (because it would fail). the schema_migrations table has to be excluded, because it has indexes which are to long the emoji tests work without database conversion, because database connection uses utf8mb4.
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