Updated "should" messages for existing tests, added tests for underscore methods object, indexOf, lastIndexOf.
Merge remote-tracking branch 'upstream/master' into development
Merge remote-tracking branch 'upstream/development' into development
Add fixes and to-dos for failing null-related assertions and 'xit' their tests.
Merge pull request #51 from tonythomson/development

Adds new tests for Underscore array-related methods, updates existing tests for Underscore methods