updated example scripts

- converted nodebox-isms to plotdevice
- various stylistic tweaks
- normalized docstrings
- converted path-dependent file operations to http
- clipped trailing whitespace
set default syntax coloring
updated split-view thumb size
reorganized image-export menu
consolidated the foundation/appkit/cg imports

- meaning the app no longer takes 10 seconds to launch on yosemite
computer maths
added build phase for Examples

- just a temporary workaround for xcode not noticing modified files in
the subdirs
- can safely be removed once the example-rewriting is complete
off-by-one