Merge branch 'master' into fix_buckets

Author: avolokhov

README.md

@@ -111,7 +111,13 @@ By default, this should be accessible on your main serving port, at the `/metric
 ```swift
 app.get("metrics") { req -> EventLoopFuture<String> in
     let promise = req.eventLoop.makePromise(of: String.self)
-    try MetricsSystem.prometheus().collect(into: promise)
+    DispatchQueue.global().async {
+        do {
+            try MetricsSystem.prometheus().collect(into: promise)
+        } catch {
+            promise.fail(error)
+        }
+    }
     return promise.futureResult
 }
 ```

Sources/Prometheus/Utils.swift

@@ -1,9 +1,5 @@
 import Foundation
 
-#if os(iOS) || os(watchOS) || os(tvOS)
-import CoreGraphics
-#endif
-
 /// Empty labels class
 public struct EmptyLabels: MetricLabels {
     /// Creates empty labels
@@ -76,8 +72,6 @@ public extension ConvertibleNumberType {
     var floatValue: Float { return Float(doubleValue) }
     /// Number as an Int
     var intValue: Int { return lrint(doubleValue) }
-    /// Number as a CGFloat
-    var CGFloatValue: CGFloat { return CGFloat(doubleValue) }
 }
 
 /// Double Representable Conformance
@@ -91,8 +85,6 @@ extension FixedWidthInteger {
 /// Double Representable Conformance
 extension Double: ConvertibleNumberType { public var doubleValue: Double { return self }}
 /// Double Representable Conformance
-extension CGFloat: ConvertibleNumberType { public var doubleValue: Double { return Double(self) }}
-/// Double Representable Conformance
 extension Float: ConvertibleNumberType { public var doubleValue: Double { return Double(self) }}
 /// Double Representable Conformance
 extension Int: ConvertibleNumberType { }