Add Crashlytics integration
Disable Crashlytics reporting for debug builds
Ignore a file with Crashlytics settings
Merge pull request #311 from codeguru42/android/crashlytics

Add Crashlytics integration
Merge pull request #313 from codeguru42/android/oncheckedchangelistener

Use `OnCheckedChangeListener`s instead of `OnClickListener`s
Add ButterKnife dependency
Remove package names on fully-qualified classes
Move variable declarations to the top
Refactor `populateSpinner()` to `populateSpinnerAdapter()`
Inject views in `LiteActivity`
Inject views in `BaseballCardDetails`
Move variable declarations to the top
Inject views in `BaseballCardList`
Move variable declarations to the top
Move variable declarations to the top
Replace `findViewById()` with `ButterKnife.findById()`
Move variable declarations to the top
Inject views in `BaseballCardDetailsTest`
Remove out dated comment
Move variables declarations to the top