Some replacements, Added CSS Codedirection, Refined ROT13

* Removed "encode" (duplicate of rot13, instead of creating duplicate functions, maybe it's a better idea to separate internal functions from the actual Twig "filter-name"?)

* Renamed functions (The Twig "filter-name" might/should probably be simplified)

* Refined ROT13 method to include "non-hyperlinked" emails.

* Replaced 'entities method' with 'CSS code direction method' based on various articles suggesting that this CSS method results in less "spam by bots" than using entities. One of the sources/articles: http://techblog.tilllate.com/2008/07/20/ten-methods-to-obfuscate-e-mail-addresses-compared/

* ISSUE: In certain cases, the "document.write" inserted with the ROT13 function causes other code/js to break (I've experienced a case were jQuery "tabbed content" breaks due to the inserted "document.write" js). The CSS code direction represents a good alternate method for "fragile" situations where the code might break.

Note:
These changes are mainly commited due to specific needs in several sites that are currently being developed, therefore this is only to be regarded as "input" & suggestions to the existing plugin from Barrel Strength Design.