add miss func
support mysqldb single value
add ignore
refactor converts
clean
bug fix
adjust
add test
typo..sorry
Merge git://github.com/petehunt/PyMySQL
Merge branch 'master' of github.com:CMGS/PyMySQL
Merge branch 'master' of git://github.com/petehunt/PyMySQL
Merge branch 'master' of https://github.com/CMGS/PyMySQL