SDK v2 updates

Android v2.2.0

• Add an option to delay the block response until the challenge solved/cancelled.
• Bug fixes and improvements.

iOS v2.2.0

• Add an option to delay the block response until the challenge solved/cancelled.
• Add an option to allow/deny evaluation of JavaScript.
• Add an option to turn off hybrid app support.
• Add 'challenge was cancelled' callback.
• Bug fixes and improvements.