Merge pull request #113 from bantu/sourceforge-url-typo

[sourceforge-url-typo] {htp:// -> http://}phpseclib.sourceforge.net
[remove-svn-version-lines] Remove useless @version: $Id$ lines.

These lines served some purpose on SVN, but are now useless on Git. They
actually do harm as they might make people think their files are older
than they actually are.