Improve the integer validator

[YagamiNewLight]

When I want to use integer validator and min/max attribute together,the min/max will not work.And I checked the integer validator,found there is no relevant field.min and field.max code,Could you please add it in integer validator?

[zoul0813]

@YgamiLight can you review PR #364 and let me know if that closes this issue?

[YagamiNewLight]

Fixed,I think.Thank you!

[zoul0813]

You think?