Now copyright comments not removing after minification

Fixed javascript-obfuscator#60

Added md5 hash of source code to seed for RandomGenerator

fixed javascript-obfuscator#58

Utility classes with state now are non-static

Merge branch 'dev'

Switched from `escodegen` to `escodegen-wallaby`

Increased runtime performance with `rc4` `stringArrayEncoding`

Switched from `escodegen` to `escodegen-wallaby`

Merge remote-tracking branch 'origin/master'

# Conflicts:
#	dist/index.js