all panic use Error
add ValidFormer interface, can custom valid
orm add atomic set value
Merge branch 'master' of github.com:astaxie/beego
orm add Exist func
fix #244
orm support complete m2m operation api / auto load related api
fix MinSize / MaxSize / Length should use Rune Count
update panic
fix #255
fix #249
fix build error
fix #247
fix #241#192
fix #253
fix #252
#238 add GetProvider
fix #238
fix isajax
fix #252