merge
add support to int32, int, uint, uint32, uint64 for pk
implemented forward scrolling resultset and updated Session.Iterator() implementation
bug fixed
docs improved
add testScroll test
comment Iterator public methods
add TODO comments
change Iterator struct naming to 'Rows' and making compatible interface to sql.Rows
update API comments
code tidy up
Merge pull request #37 from nashtsai/scrolling-rs

Scrolling rs
tests bug fixed
add benchmark tests for mssql
Merge pull request #39 from nashtsai/master

make Import() call Db.Exec() directly
add Contributing.md
resolved #36
docs improved
Merge branch 'master' of github.com:lunny/xorm
improved docs