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
Fix CodeSniffer violations for PHP files

Fix violations for Zend.Files.ClosingTag.NotAllowed
Fix grammar for the hidepages description
Fix grammar for allowdebug description

Add a full stop between sentences for the allowdebug description.
Fix grammar in proxy_except description

Remove trailing preposition.
FS#2840 fix typo in debug message
Merge pull request #318 from mperry2/text-fix

Fix several grammar mistakes in the configuration manager
Merge pull request #315 from mperry2/cs-code

Fix CodeSniffer violations for Generic.PHP.LowerCaseConstant.Found
Merge pull request #316 from mperry2/cs-closingtag

Fix CodeSniffer violations for Zend.Files.ClosingTag.NotAllowed
Fix CodeSniffer violations for PHP files

Fix violations for Squiz.Commenting.DocCommentAlignment.SpaceBeforeTag

Conflicts:
	inc/parser/xhtml.php