Warn if an application lacks a Store property

Attempts to use model class related methods that alias
to the store currently throw
`TypeError: Cannot read property 'find' of undefined`

This commit improves the message and offers a suggested
solution.
Fixed trailing commas which breaks IE7.
Warn, don't fail, when there are no fixtures
Fail rather than returning all fixtures when queryFixtures is not implemented
Merge pull request #700 from airportyh/fix_trailing_commas_ie7

Fixed trailing commas which breaks IE7.
Merge pull request #707 from CrowdStrike/missing-fixtures

Warn, don't fail, when there are no fixtures
Merge pull request #706 from CrowdStrike/query-fixtures

Fail rather than returning all fixtures when queryFixtures is not implemented
Merge pull request #689 from trek/improve-error-message-for-missing-store

Warn if an application lacks a Store property
creating a new branch and just updating the https to see if that will not cause the Travis build to fail

add https to Gemfile.lock
Merge pull request #757 from cgcardona/gemfile_update

Updating `source` in Gemfile to point to `https`