Add Compatibility Mode
Support upcase column names
Support slice of pointers
Update README
Fix error when deploying to google app engine

github.com/jinzhu/gorm/postgres.go:103:21: composite struct literal database/sql.NullString with unkeyed fields
Don't set primary key is alrady exists
Merge pull request #163 from jimbao/master

Fix error when deploying to google app engine
Fix link to section in README

It seems to be case sensitive, change tableName -> tablename.
Fix couple cosmetic typos
Fix couple misleading test failure messages
Merge pull request #165 from rtfb/typos

Various typo fixes
Extract method FieldByName
Update README
Export method ToSnake and SnakeToUpperCamel
Add basic support for DEFAULT values
Simplify set field value
Merge pull request #170 from chr4/master

Add basic support for DEFAULT values
Support inline condition when Delete
Fix typo
Refact untils.go