(CE-1051) Quick fix for caching in SharedHelp

SharedHelp tries to get the parser cache key from the text it gets
from the help wikia, and use that to save HTTP requests. The string
in the text it is parsing looks like:
<!-- Saved in parser cache with key wikia:pcache:idhash:16765-1!*!0!!en!*!* -->

Shared help was looking for the string 'end' to find the end of the
cache key. Because this string isn't in that comment, the resulting
parser cache key it would store would look something like
'wikia:pcache:idhash:16', which of course doesn't work. I'm not sure
this ever worked and probably should have been 'and' in the previous
version of the string before we removed the timestamp. This fixes that
parsing so the working parser cache key is stored.
(CE-1051) Cache SharedArticle info for 24 hours

Removes the timestamp check which was only checking for 10 minutes and
sets the cache entry to 24 hours. We need to bump the cache version to
make sure old stuff uses the new way.
Merge pull request #5424 from Wikia/release-252-CE-1051

(CE-1051) Quick fix for caching in SharedHelp