Fixed link for Enhance PHP

Thanks to @w00 for pointing this one out in #332.
Remove an extraneous 'to'; rectify an instance of an incorrect verb tense; small adjust to punctuation.

Original text noted that it's "usually a good idea to follow to common patterns". Removed extra 'to'. 

In MVC section the sentence "The model-view-controller (MVC) pattern... let..." should be changed to "The model-view-controller (MVC) pattern...lets..."

Also added a semicolon to a sentence in the Factory section that Strunk and White would agree enhances the clarity of the sentence.
Updated mwop's Twitter account
coding style fix
Update GA snippet
Merge commit '7e2b75d83a842d569ce9aa82bdd113ddfd529f2d' into gh-pages

Conflicts:
	_posts/07-01-01-Databases.md
	_posts/09-03-01-Password-Hashing.md
	pages/Design-Patterns.md