* crypto/cloudflare: fix nil deref in random G1/G2 reading * crypto/bn256: improve fuzzer * crypto/bn256: fix some flaws in fuzzer
* Added checks for nil pointers in Marshal functions * Set nil pointer to identity in GT before marshaling
* core/vm, crypto/bn256: switch over to cloudflare library * crypto/bn256: unmarshal constraint + start pure go impl * crypto/bn256: combo cloudflare and google lib * travis: drop 386 test job