bugfix

Signed-off-by: 商讯在线 <swhbox@foxmail.com>
update func (session *Session) cacheFind, if no cache hit, continue instead of return error
Merge branch 'master' of github.com:go-xorm/xorm
bug fixed for Desc & Asc
All cols not being reset, causes problems when using the session again after AllCols()

Signed-off-by: Alfred Hall <ahall@ahall.org>
Merge pull request #158 from ahall/master

All cols not being reset, causes problems when using the session again a...
guard uninitialized time in  func (engine *Engine) TZTime(t time.Time)
Merge branch 'master' of github.com:go-xorm/xorm
fix bug

Signed-off-by: 商讯在线 <swhbox@foxmail.com>
add log level support to simple logger
Merge branch 'master' of github.com:go-xorm/xorm
add TODO comments
fixed error usage in simple logger

make default log level DEBUG
update ILogger interface, to reduce performance cost where string format or concat is done when it's need to write out
Merge pull request #159 from go-xorm/tidy-up/logger

update ILogger interface, to reduce performance cost where string format...
move syslogger as condition compile
bug fixed
fixed build tag
performance optimization for Find(), 10000 times - MultiRead limit 100 from 24.57s to 5.29s
Merge branch 'master' of github.com:go-xorm/xorm