Reset rewrite counter on new request

We were spuriously throwing rewrite limit exceeded for non-looping
rewrites. This patch resets the count to zero at the start of a new
request and adds a test.

COUCHDB-1651
Removed alpha version
fixed build
whitespace
Correcting NEWS and CHANGES discrepancies
Correcting NEWS and CHANGES discrepancies
Correcting NEWS and CHANGES discrepancies
Correcting NEWS and CHANGES discrepancies
Correcting NEWS and CHANGES discrepancies
Correcting NEWS and CHANGES discrepancies
Correcting NEWS and CHANGES discrepancies
Correcting NEWS and CHANGES discrepancies
Correcting NEWS and CHANGES discrepancies
Correcting NEWS and CHANGES discrepancies
Correcting NEWS and CHANGES discrepancies
Added CVE-2010-3854 to NEWS and CHANGES
Added CVE-2010-2234 to NEWS and CHANGES
Added info about release time deps
fix 250*.t
Update copyright year to 2013