Moved global constants to class constants
Merge branch 'php5' of https://github.com/phpseclib/phpseclib into NetPackageConstantsFix

Conflicts:
	phpseclib/Net/SSH2.php
Merge pull request #532 from cnelissen/NetPackageConstantsFix

Net package constants fix

* cnelissen/NetPackageConstantsFix: (53 commits)
  Add #@+ block for properties used by internal implementation.
  Move in-code comments to property doc blocks.
  Refactor defined MATH_BIGINTEGER_ constants into class constants.
  Add public keyword to Crypt\Random::string().
  crypt_random_string() -> Random::string()
  Moved global constants to class constants
  Added SSH_AGENT_FAILURE constant back in
  Docblock fix
  Missed a couple SYSTEM_ prefixes
  Moved global constants to class constants
  Moved global constants into class constants and updated all references
  Remove LICENSE text from source code files.
  Code sniff php version fix
  Code sniffer php version fix
  Alias the php5 branch as 2.0.x for now
  Removed includes for Random.php and fixed up user_error message
  Renamed Random::crypt_random_string to Random::string
  Regenerated lock file
  Namespaced Crypt\Random
  Removed duplicated docblock text
  ...
Merge branch 'master' into php5

* master:
  Moved global constants to class constants