Dev hashinfo

## Added HashInfo class and crypt/verify methods.
This commit related with issue #1.
https://github.com/ritou/p5-Crypt-Password-StretchedHash/issues/1

## Remove OBJECT validation by Params::Validate
This commit related with tester's report.
http://www.cpantesters.org/cpan/report/0f2924f6-d971-11e2-8ad3-1b2260117a5d