Bug fix/bug prevention/consistancy: Checked all used of preg_ functions for best practices
And some more of the same
* Added two suggestions for regex improvement, one fully worked out
Replaced a number of unneeded preg_() calls with the more efficient strpos() and substr_replace()

Improved one regex combi call to be more efficient
Identified potential bug and provided fix suggestion.
Potential bugfix when replytocom link use " instead of ' as attribute delimiter + suggestion for future improvement
Added initials to fixes not yet applied so if anyone needs to discuss, they know who to discuss with ;-)
Accommodated for utf-8 phrases in the pattern in three more places (where preg_quote() was used)
Merge branch 'master' of git://github.com/jdevalk/wordpress-seo into preg-best-practices

Conflicts:
	admin/class-admin.php
	inc/wpseo-non-ajax-functions.php
	readme.txt
Merge pull request #81 from jrfnl/preg-best-practices

Preg best practices