multiple camera instances enabled

Signed-off-by: jayrambhia <jayrambhia777@gmail.com>
few small changes
Merge branch 'develop' of github.com:sightmachine/SimpleCV into develop
Merge pull request #422 from jayrambhia/Camera/multiple_instances_resend

multiple camera instances enabled (Issue #389)
copy/pasting
example docs
Merge pull request #461 from vighneshbirodkar/blurf

Image Blur - new pull request. Awesome. Thanks!