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Merge branch 'master' of https://github.com/dstucrypt/dstu-validator
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Fix point compression
Add new API method `pubverify`

New API method verifies signature agains document hash
and public key.

API is exposed via POST method with three body arguments:

`p` - public key should in hexadecimal form without preceeding 03 byte,
`h` - document hash (dstu34311) in hexadecimal form
`s` - signature in ASN1 short format encoded in base64 form

Note: currently only PB_257 (curve6) signatures are supported