Beacon Region

Beacon region is like a filter or a regular expression. Each beacon is identified by three values:

Proximity UUID, most commonly represented as a string, e.g. CB10023F-A318-3394-4199-A8730C7C1AEC.
Major, an unsigned short integer, i.e., an integer ranging from 1 to 65535, (0 is a reserved value).
Minor, also an unsigned short integer, like the major number.

There are four options when it comes to ranging or monitoring beacon by a region:

Proximity UUID + Major + Minor, the most specific option that only scan beacon with specific proximity UUID, major and minor.
```
NSUUID *uuid = [[NSUUID alloc] initWithUUIDString:@"CB10023F-A318-3394-4199-A8730C7C1AEC"];
CBRegion *region = [[CBRegion alloc] initWithProximityUUID:uuid major:1 minor:284 identifier:@"regionId"];
```
By using this region, scanner only return beacon(s) with proximity UUID CB10023F-A318-3394-4199-A8730C7C1AEC, major number 1 and minor number 284
Proximity UUID + Major, option that only scan beacon with specific proximity UUID and major number.
```
CBRegion *region = [[CBRegion alloc] initWithProximityUUID:uuid major:1 identifier:@"regionId"];
```
By using this region, scanner only return beacon(s) with proximity UUID CB10023F-A318-3394-4199-A8730C7C1AEC, major number 1 and minor number within range 0 to 65535.
Proximity UUID, option that only scan beacon with specific proximity UUID.
```
CBRegion *region = [[CBRegion alloc] initWithProximityUUID:uuid identifier:@"regionId"];
```
By using this region, scanner only return beacon(s) with proximity UUID CB10023F-A318-3394-4199-A8730C7C1AEC, major and minor number within range 0 to 65535 for each of it.

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