ISLANDORA-2248: Prevent PHP Strict standards issue

[d-r-p]

JIRA Ticket: https://jira.duraspace.org/browse/ISLANDORA-2248

What does this Pull Request do?

Avoid

PHP Strict standards:  Declaration of _XMLDocument::loadHTMLFile() should be compatible with DOMDocument::loadHTMLFile($source, $options = NULL) in xml/XMLDocument.inc on line 252

in PHP 5.4+ (note that this error has been observed also in TravisCI's build step).

What's new?

Update signature of _XMLDocument::loadHTMLFile() to account for optional $options argument introduced in PHP 5.4 (see JIRA ticket for more background).

How should this be tested?

Execute

php -l -d error_reporting=-1 xml/XMLDocument.inc

inside the PHP Lib module directory (/var/www/drupal/sites/all/modules/php_lib on standard vagrant VM). Before this PR, you would see the aforementioned error, after this PR, you should see

No syntax errors detected in xml/XMLDocument.inc

Alternatively, check that this PR passes TravisCI (check logs!).

Additional Notes:

• Does this change require documentation to be updated? no
• Does this change add any new dependencies? no
• Does this change require any other modifications to be made to the repository (ie. Regeneration activity, etc.)? no
• Could this change impact execution of existing code? no

Interested parties

@DiegoPino @Islandora/7-x-1-x-committers

[DiegoPino]

@d-r-p cool. since we are still on time here, would you mind making a release pull too? Only if you can. @willtp87 i'm also ok, good to merge in 20 hours or so or whenever you feel is Ok. Thanks guys