use request module proxy support
Merge branch 'master' into feat.proxy-support
prevent proxy from being set more than once
rename opentok.client to opentok._client to indicate its internal
Merge branch 'feat.proxy-support' into client-configuration
add proxy support, fixes #41
Merge branch 'master' into client-configuration
adds configurable timeout, fixes #51
expose apiUrl on OpenTok instance, fixes #39
Merge pull request #53 from aoberoi/client-configuration

Client configuration