Handle unicode in headers when writing and retrieving cache entries. Who says headers have to be ASCII! Fixes issue 138.
Handle unicode in headers when writing and retrieving cache entries. Who says headers have to be ASCII! Fixes issue 138.

bearieq/httplib2,smurfix/httplib2,dchusovitin/httplib2,bearieq/httplib2,bearieq/httplib2,vytisb/httplib2,javitjacob/httplib2,gcd0318/httplib2,wikimedia/pywikibot-externals-httplib2,gcd0318/httplib2,dchusovitin/httplib2,ccstolley/httplib2,ccstolley/httplib2,arcot/httplib2,ashkanalam/httplib2,javitjacob/httplib2,vinodc/httplib2,vinodc/httplib2,vytisb/httplib2,jayvdb/httplib2,jcgregorio/httplib2,jcgregorio/httplib2,wikimedia/pywikibot-externals-httplib2,smurfix/httplib2,jayvdb/httplib2,arcot/httplib2,smurfix/httplib2,ashkanalam/httplib2