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

bump version to 2.3.1

bump version for release

Allow default .hdf to be compiled in to php binary

Reviewed By: @swtaarrs

Differential Revision: D1013374