Added `ValidateStruct` to validate a struct without a request (thedev…

…saddam#57) (thedevsaddam#58)

Fixes thedevsaddam#12

Fix issue thedevsaddam#51

Fix issue thedevsaddam#48

Fix issue with exponential float number

Add alpha_space and fix typo (thedevsaddam#42)

* Changed from max to min in the README.md. Seems to have been a typo. (thedevsaddam#38)

*  Fixed a couple of typos. (thedevsaddam#39)

* Changed from max to min in the README.md. Seems to have been a typo.

* Fixed a couple of typos.

*  Add new rule alpha_space (thedevsaddam#41)

* Add new rule alpha_space

* use gofmt

* Fix typo

Remove rules deletion; Add null support

Fix: Issue thedevsaddam#24

Fix: file validation custom rule. Issue thedevsaddam#19

Fix: file validation

Fix: issue thedevsaddam#15