add tx validation to test
remove unused code from Script. Update it to do not use scriptSig placeholders
signature sorting in .sign and .merge in transaction builder
rm spaces
add new SecureRandom class that does the right thing

Generating random numbers properly depends on the platform. The new
getRandomBuffer method does the right thing on the right platform. It will
sometimes fail due to insufficient entropy. The getPseudoRandomBuffer class is
also provided that will never fail, but it is not cryptographically secure and
should not be used for keys.
fix issues with ConnectionTor example and Connection class
remove unnecessary "change" console.log from Electrum test
use SecureRandom in Key in the browser

...to make sure random numbers are generated securely
rm log
Merge pull request #281 from matiu/feature/signature-sorting

Feature/signature sorting
rng statistic testswq
testing RNG
fix runs test
reduce number of cases for browser
skip pending tests:wq
skip statistically failing tests
Merge pull request #284 from maraoz/test/rng

Tests for RNG
Key should make sure new privkey is less than N

...this involves adding a Curve class, and significant refactoring to make this
possible in a clean way.
removes buffertools dependencies in browsers Key.js
Merge pull request #285 from matiu/bug/firefox1

removes buffertools dependencies in browsers Key.js