Merge pull request #16 from lucasb-eyer/master

Added a versioninfo().
Updated README to make optional dependence on Images.jl clear
Update to VideoIO.jl

* Use new BinDeps features like library groups
* Update build incantations for new versions/platforms
* Remove all postproc stuff
* update REQUIRES

Edit: disable {av,sw}resample, other minor additional updates (kms)
Merge pull request #18 from kmsquire/staticfloat_rebase

Update to VideoIO.jl
Camera updates

* Update playvid example to allow "playing" from camera
* Update README to demonstrate reading from a camera
Update README with viewcam() example.

Also: flip camera image when displaying.
Add "Installation" information to the README
Add back ZipFile to REQUIRE
Change default Mac camera name to "FaceTime"

This really needs to be probed, but it's likely that this is
a better default than "Integrated" on newer macs.
Adds pacman support.