Additional way to calculate the request body size.
Added method "testProperlyHandlesProxyHeadersWithCurlBug2"
fixed typing bug
Explicitly set arg separator to "&" in http_build_query calls.
Merge pull request #125 from itsgoingd/fix-build-query

Explicitly set arg separator to "&" in http_build_query calls.
Merge pull request #116 from stepanselyuk/master

Additional way to calculate the request body size.