stop breaking ubuntu 10.04

Summary: A partial revert of facebook#3591 . I used `FindLibZip.cmake` as a template. I think for system defined libraries the old code was good enough, but if the thing is only installed in the CMAKE_INCLUDE_PATH then the macro@​radford was using won't work.

Reviewed By: @JoelMarcey

Differential Revision: D1560119

set version to 3.2

unit tests expected output fix for change in object destruction order

Summary: Fi unit tests expected output

Reviewed By: mwilliams

Subscribers: hphp-diffslists, ps

Don't build test binary by default.

Enable it with `cmake -DTEST_BIN=On .`

bump version to 3.0.0

Revert "Properly invoke setter/getter for unset declared properties"

This reverts commit 2638538.

bump version to 2.4.1

bump version to 2.4.0

Revert "Update folly"

This reverts commit 4cf5378.

bump version to 2.3.2