Refactor AccessToken

[0pdd]

The puzzle 14-fde3094d from #14 has to be resolved:

finapi-java-client/src/main/java/org/proshin/finapi/accesstoken/AccessToken.java

Lines 21 to 23 in 93df483

	* @todo #14 Refactor AccessToken: leave accessToken only in this interface. Create two new interfaces
	* UserAccessToken and ClientAccessToken with appropriate methods. Create new class SimpleAccessToken that receives
	* a simple access token string. And finally get rid of FakeAccessToken.

The puzzle was created by Roman Proshin on 26-Aug-18.

Estimate: 0 minutes,

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