Update statement.go

delete the COLUMN in genAddColumnStr function
Merge pull request #1 from betazk/test-branch

Update statement.go
start & limit implementation for mssql
mssql bug fixed
Merge branch 'mssqllimit' of https://github.com/go-xorm/xorm into mssqllimit
bug fixed for mssql limit
bug fixed
Merge branch 'mssqllimit' of github.com:go-xorm/xorm into mssqllimit
Merge branch 'master' of github.com:go-xorm/xorm
bug fixed and improved IsTableExist
Merge branch 'master' of https://github.com/betazk/xorm into betazk-master
Merge branch 'betazk-master'
In method now can receive slice for first params
Merge pull request #2 from go-xorm/master

merge master