Revert changes to phpseclib to previous commit

Michael Hamann commented in pull request #306 that phpseclib has not
been adopted by the DokuWiki project. Therefore, the changes made to
reduce the CodeSniffer violations should be reverted and the local copy
of phpseclib should be excluded from CS checks. This commit reverts the
previous changes and adds the appropriate exclusion rule.
Exclude files from CodeSniffer checks

Exclude inc/blowfish.php and lib/scripts/fileuploader.js from
CodeSniffer checks.
Fix CodeSniffer violations for PHP files

Fix violations for Generic.PHP.LowerCaseConstant.Found
Merge pull request #315 from mperry2/cs-code

Fix CodeSniffer violations for Generic.PHP.LowerCaseConstant.Found