update gitignore to ignore npm-debug.log
fix canary build for recent Ember.Container refactors

refactors: https://github.com/emberjs/ember.js/pull/9981
Merge pull request #2626 from emberjs/container-refactor-fixes

fix canary build for recent Ember.Container refactors
Fix references to buildURL in documentation

The correct naming for this is `buildURL` rather than `buildUrl`.
Merge pull request #2627 from corpulentcoffee/buildurl-references

Fix references to buildURL in documentation
changelog prep for beta.13
ie8 fixes
Merge pull request #2629 from emberjs/ie8-fixes-beta.13

ie8 fixes
release v1.0.0-beta.13
fix changelog indentation
MOAR indentation fixes
one more round of indentation fixes

i am sorry :(