Added info_string#102

Merged

9prady9 merged 4 commits intoarrayfire:develfrom

Feb 16, 2017

Commits on Feb 13, 2017

Commits on Feb 15, 2017

Added wrappers around `af_alloc_host` and `af_free_host` in the util module.
botev
committed

Commits on Feb 16, 2017

Changed `0 as *` to `::std::ptr::null`.
botev
committed