Package Errors:
- add function to check & cast error interface into golib Error interface
- update CodeError type to simplify management & error creation
- add function to simplify call of Error function from a generic error interface
- remove some useless function from Error interface
All Other Packages:
- apply change of package Errors into all other packages
* implement SMTP lib interface
* check number of sent mail in a time lapse before sending new mail
* if time since last reset is over, reset counter
* add feature to call a user function on each counter reset
- Pkg SMTP : Fix race detection & segFault
- Pkg Mailer : add new function to parse all template value with the given map[string]string
- smtp : refactor smtp packgage and allow connection context for smtp
- mailer : add package for templating mail (using hermes lib)
- mail : add package to format mal with header to be send to smtp (using lib smple mail)
Add function in package :
- errors : add function to retireve a map of minimal error code and package path of the getMessage function
- version : add function to get root path of package (still existing but not return before this function)
- ioutils : add function to expand bytes.buffer as io.ReadCloser interface
