Wrote initial specs for calls and conferences.
Specified conferences in more detail.
Remove 'has' from Conference's childcare and code_of_conduct attributes
Drove out nested call resource.
Extracted duplicated setup code into factories.
Creates form and create for CFPs.
Add .rspec to .gitignore
Add create functionality for conferences.
Refactor specs to use factories.
Merge pull request #1 from callbackwomen/create-call-model

Create conferences and calls for proposals