added local js and css files.

Added local files for javascript and css libraries. So, you dont have to
use cdn.
fixed script reference
Transactions markup in block page

Fixed transactions mark up in block page.
added custom error handle function

added new function page_error to handle mark up in error pages.
error page css
fixed a few issues in error pages
Merge branch 'patch-1' of https://github.com/geekz/bitcoin-abe into geekz-patch-1
Add "../"s to homepage link on error page.  Removed simplejson dep.