skip `test_unicode_column_name` for `MysqlAdapter`.
skip `test_unicode_column_name` for `MysqlAdapter`.

This commit fixes the build but we need to further investigate the root cause,
to see if it can be fixed.

The test fails under `MysqlAdapter` with:

```
ActiveRecord::UnknownAttributeError: unknown attribute: なまえ
```

The root cause is that the returned column names from the adapter
have the wrong encoding:

```ruby
columns = Weird.columns_hash.keys
columns # => ["id", "a$b", "\xE3\x81\xAA\xE3\x81\xBE\xE3\x81\x88", "from"]
columns.map(&:encoding) # => [#<Encoding:ASCII-8BIT>, #<Encoding:ASCII-8BIT>, #<Encoding:ASCII-8BIT>, #<Encoding:ASCII-8BIT>]
columns.map {|c| c.dup.force_encoding "utf-8"} # => ["id", "a$b", "なまえ", "from"]
```

From what I can tell the MySQL variables are fine:

```
ActiveRecord::Base.connection.execute("show variables")

...
character_set_client utf8
character_set_connection utf8
character_set_database utf8
character_set_filesystem binary
character_set_results utf8
character_set_server utf8
character_set_system utf8
character_sets_dir /usr/local/Cellar/mysql/5.5.29/share/mysql/charsets/
collation_connection utf8_general_ci
collation_database utf8_unicode_ci
collation_server utf8_general_ci
...
```

starknx/rails,bradleypriest/rails,maicher/rails,xlymian/rails,rbhitchcock/rails,kirs/rails-1,rossta/rails,arjes/rails,yahonda/rails,ttanimichi/rails,mtsmfm/rails,schuetzm/rails,marklocklear/rails,koic/rails,deraru/rails,yawboakye/rails,rossta/rails,printercu/rails,arunagw/rails,mijoharas/rails,palkan/rails,kachick/rails,shioyama/rails,yasslab/railsguides.jp,fabianoleittes/rails,Vasfed/rails,yahonda/rails,yalab/rails,odedniv/rails,printercu/rails,gauravtiwari/rails,gavingmiller/rails,rbhitchcock/rails,jeremy/rails,amoody2108/TechForJustice,rbhitchcock/rails,koic/rails,Spin42/rails,mtsmfm/railstest,Erol/rails,georgeclaghorn/rails,illacceptanything/illacceptanything,lcreid/rails,aditya-kapoor/rails,printercu/rails,sealocal/rails,kmayer/rails,palkan/rails,gavingmiller/rails,matrinox/rails,hanystudy/rails,esparta/rails,prathamesh-sonpatki/rails,palkan/rails,vipulnsward/rails,kddeisz/rails,schuetzm/rails,kmcphillips/rails,fabianoleittes/rails,betesh/rails,Envek/rails,kirs/rails-1,tjschuck/rails,pvalena/rails,joonyou/rails,lcreid/rails,tgxworld/rails,sergey-alekseev/rails,deraru/rails,stefanmb/rails,tgxworld/rails,betesh/rails,maicher/rails,brchristian/rails,iainbeeston/rails,arunagw/rails,mechanicles/rails,gfvcastro/rails,illacceptanything/illacceptanything,elfassy/rails,samphilipd/rails,bolek/rails,EmmaB/rails-1,iainbeeston/rails,bolek/rails,Sen-Zhang/rails,felipecvo/rails,vipulnsward/rails,brchristian/rails,ttanimichi/rails,utilum/rails,88rabbit/newRails,amoody2108/TechForJustice,Edouard-chin/rails,Edouard-chin/rails,yhirano55/rails,88rabbit/newRails,Stellenticket/rails,fabianoleittes/rails,joonyou/rails,vassilevsky/rails,kenta-s/rails,ngpestelos/rails,richseviora/rails,deraru/rails,arunagw/rails,ttanimichi/rails,riseshia/railsguides.kr,iainbeeston/rails,hanystudy/rails,kmcphillips/rails,riseshia/railsguides.kr,rails/rails,lcreid/rails,pschambacher/rails,sergey-alekseev/rails,untidy-hair/rails,kamipo/rails,gauravtiwari/rails,gauravtiwari/rails,mohitnatoo/rails,mtsmfm/rails,Stellenticket/rails,yasslab/railsguides.jp,kachick/rails,samphilipd/rails,tijwelch/rails,kamipo/rails,yawboakye/rails,rafaelfranca/omg-rails,Spin42/rails,sergey-alekseev/rails,alecspopa/rails,yahonda/rails,lucasmazza/rails,alecspopa/rails,illacceptanything/illacceptanything,kddeisz/rails,georgeclaghorn/rails,Envek/rails,arunagw/rails,repinel/rails,jeremy/rails,koic/rails,pvalena/rails,kaspth/rails,bradleypriest/rails,yhirano55/rails,ledestin/rails,mohitnatoo/rails,palkan/rails,kamipo/rails,Spin42/rails,kddeisz/rails,kachick/rails,jeremy/rails,prathamesh-sonpatki/rails,ngpestelos/rails,MichaelSp/rails,illacceptanything/illacceptanything,gfvcastro/rails,Envek/rails,vipulnsward/rails,notapatch/rails,kirs/rails-1,bogdanvlviv/rails,rails/rails,utilum/rails,illacceptanything/illacceptanything,illacceptanything/illacceptanything,xlymian/rails,BlakeWilliams/rails,starknx/rails,assain/rails,odedniv/rails,assain/rails,mijoharas/rails,BlakeWilliams/rails,baerjam/rails,betesh/rails,schuetzm/rails,illacceptanything/illacceptanything,mathieujobin/reduced-rails-for-travis,pschambacher/rails,Vasfed/rails,gcourtemanche/rails,kmcphillips/rails,kmcphillips/rails,shioyama/rails,travisofthenorth/rails,starknx/rails,MichaelSp/rails,mohitnatoo/rails,rails/rails,illacceptanything/illacceptanything,alecspopa/rails,untidy-hair/rails,untidy-hair/rails,yhirano55/rails,baerjam/rails,Erol/rails,mohitnatoo/rails,yalab/rails,Vasfed/rails,matrinox/rails,illacceptanything/illacceptanything,aditya-kapoor/rails,amoody2108/TechForJustice,illacceptanything/illacceptanything,ledestin/rails,illacceptanything/illacceptanything,illacceptanything/illacceptanything,Edouard-chin/rails,mechanicles/rails,repinel/rails,yalab/rails,rafaelfranca/omg-rails,georgeclaghorn/rails,aditya-kapoor/rails,mathieujobin/reduced-rails-for-travis,mathieujobin/reduced-rails-for-travis,repinel/rails,BlakeWilliams/rails,rafaelfranca/omg-rails,esparta/rails,aditya-kapoor/rails,rossta/rails,eileencodes/rails,rails/rails,coreyward/rails,kenta-s/rails,iainbeeston/rails,betesh/rails,illacceptanything/illacceptanything,repinel/rails,utilum/rails,untidy-hair/rails,vassilevsky/rails,hanystudy/rails,notapatch/rails,riseshia/railsguides.kr,tjschuck/rails,gavingmiller/rails,bradleypriest/rails,tijwelch/rails,ledestin/rails,Sen-Zhang/rails,Edouard-chin/rails,gfvcastro/rails,Stellenticket/rails,ngpestelos/rails,travisofthenorth/rails,tgxworld/rails,eileencodes/rails,BlakeWilliams/rails,elfassy/rails,esparta/rails,voray/rails,gcourtemanche/rails,marklocklear/rails,coreyward/rails,Stellenticket/rails,Erol/rails,MSP-Greg/rails,vipulnsward/rails,esparta/rails,odedniv/rails,sealocal/rails,yahonda/rails,coreyward/rails,arjes/rails,stefanmb/rails,felipecvo/rails,samphilipd/rails,fabianoleittes/rails,baerjam/rails,kddeisz/rails,brchristian/rails,MSP-Greg/rails,notapatch/rails,Erol/rails,matrinox/rails,tgxworld/rails,stefanmb/rails,assain/rails,pvalena/rails,yhirano55/rails,illacceptanything/illacceptanything,lcreid/rails,flanger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