add contributing.md with notes on how to contribute to the eak website

Bluntly stolen from the ember.js CONTRIBUTING.md
Merge pull request #459 from ghedamat/mattia/contributing

add contributing.md with notes on how to contribute to the eak website
Don’t call `factory()` before calling to `delegate()`. Allows injections to be specified in the provided `delegate()` function.
Merge pull request #462 from aexmachina/master

Don’t call `factory()` before calling to `delegate()` in `moduleFor()`
Merge branch 'master' of git@github.com:stefanpenner/ember-app-kit.git
add support to change api prefix

(from the /api default)
Merge pull request #466 from ghedamat/mattia/proxy-prefix-parameter

add support to change api prefix (from the /api default)
[Bugfix  test-helpers] components should have the correct template
[Bugfix test-helpers] fix regression introduced by28af52165084c8890a277332a4c4725c671ae6f9 , which prevented template less components from being testable
Testing: use fullName if module doesn't have description
Merge pull request #478 from jas/master

Testing: use fullName if module doesn't have description
fixes moduleForModel
replaces factory with name
Merge pull request #480 from fsmanuel/fix_module_for_model

fixes moduleForModel
tidy up loader.js
re-enable run-time cycles.

Please note this does NOT (and will not) address design time module cycles.
[Fixes #490, #488] restore run-time cycle support to the loader.

This does so, while continue to support good error handling semantics.
If the module failed to load, previously it would not fail to load the second time, merely become the empty SEEN object. This results in very crappy debugging experiences.

Also, wrapping the experience in a try/catch would cause different but equally as terrible experiences.

So this solution utilizes a try/finally to correctly set and track state of modules.
Please note, that if an error occurs while loading a module in IE8, it will fail due to no "catch" being present in the try/finally block. But this trade-off seems fair.
Dasherize all file names
Merge pull request #501 from MajorBreakfast/master

Dasherize all file names
Fix test loader for dasherized file names.

Commit 036df2e2c00aee broke the test loader so that no test modules were
found or loaded, and no tests run.