Add possibility to create custom ScanPeriods and ForceScanConfigurations in configure.

[andrekovac]

Not added for now because it's not stable yet.

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Some details:

• These values have dependencies within and between each other which hence demand more effort right now to test thoroughly
• For example the error of number 3 of the list below 1) does not occur while setting the configuration, but when starting to scan and 2) is somehow not catched by the try-catch-loop inside the startScanning method of the ScanManager class and causes the app to crash (Perhaps have to try to include a nested try-catch inside onServiceReady here..)

Some of the value dependencies:

1. The active scan period must be a positive value equal or longer than 3000 ms
2. The passive scan period must be a positive value equal or higher than 2000ms or equal to 0.
3. Activity check period must be shorter than active scan period #(https://github.com/kontaktio/kontakt-android-sdk/issues/145) , i.e. the first argument activePeriod of scanPeriod has to be greater than the second argument checkPeriod of activityCheckConfiguration.

[andrekovac]

Available in version 1.2.0. See README for more details.