Allowing re-parsing of inserted Pinterest links

Links added to the DOM, properly tagged for Socialite, would not be
re-parsed as buttons by the Pinterest script.  This commit adds a
'data-pin-build' parameter to the pinit.js script (which exposes the
parsePinBtns function) and replaces the reloadNetwork call with a call
to this function.
Merge pull request #84 from McGeekiest/master

Allowing re-parsing of inserted Pinterest links