RC2: Optimizations, inline-crypt bug fix
Crypt_*: CS and comments

- Crypt_* Some CS
- Crypt_Base: better comments for phpseclib developers
- Crypt_Base::_createInlineCryptFunction(): better namespace for
internal variables (all now prefixed with an underscore to avoid
conflicts)
Crypt_base: Typo
Crypt_Base: removed die(1)

re:
https://github.com/phpseclib/phpseclib/commit/89ea2da86bb73553e5990b6d06bef062ea176ef9#commitcomment-3505770
Merge branch 'master' of https://github.com/petrich/phpseclib into petrich-master

Apply pull request https://github.com/phpseclib/phpseclib/pull/124
RC2: Changes according to arguments in https://github.com/phpseclib/phpseclib/pull/124
ASN1: Integers should by at least 1 byte long.
Fixes https://github.com/phpseclib/phpseclib/issues/126.