Do not use angular-strap 2.2.0 or 2.2.1

[nicklasb]

A bug introduced in angular-strap 2.2.0 causes the component to not work properly, instead use angular-strap 2.1.6: mgcrea/angular-strap#1587

I will soon release a minor version that excludes 2.2.0 and on from dependencies.

[nicklasb]

A version, 0.3.2, has been released that works around this issue until resolved.
It makes bower downgrade angular-strap to 2.1.6 when angular-schema-form-dynamic-select is updated.

The release: https://github.com/OptimalBPM/angular-schema-form-dynamic-select/releases/tag/v0.3.2