add request exception logging
fix context filter dotted path in logging
log request exceptions to file using request_exception_log_file in site_config
Merge pull request #679 from anandpdoshi/anand-july-7

Fixes in Website Generator and Data Import test case
fix whitespace
Merge pull request #673 from pdvyas/request-exception-log

add request exception logging
Merge pull request #680 from anandpdoshi/anand-july-7

Minor fixes
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