removed Id type changed tag name
if stmt is nil, can't close without panic :(
fixed zero value panic
Update readme
exclude Id column when insert if  Id value is zero
Added WhereEqual method
Suppor string primary key for PostgreSQL
Several Updates

Added "Close" method to close database.
Added "OmitJoin" method to omit join fields in struct.
Added support for multiple order by.
Added "DropTable" API for testing.
import "strings"
update readme
Add link to GoDoc
Remove Intellij boilerplate (which otherwise shows up in GoDoc).
Merge pull request #7 from jmcvetta/master

Add link to GoDoc
change Sqlite3 dialect to unexported.
added contributors
fixed IndexExists bug on mysql
add indexExists support for sqlite3
Multiple change

Removed Dialect Now(), changed postgresql timestamp type to support time
zone.
Added IndexExists support for postgresql
change index name, add table name at first.