Let ListMonitor expose methods for Section Indexes (fixes #32)

CoreStore.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
     s.name = "CoreStore"
-    s.version = "1.4.1"
+    s.version = "1.4.2"
     s.license = "MIT"
     s.summary = "Unleashing the real power of Core Data with the elegance and safety of Swift"
     s.homepage = "https://github.com/JohnEstropia/CoreStore"

CoreStore/Info.plist

@@ -15,7 +15,7 @@
 	<key>CFBundlePackageType</key>
 	<string>FMWK</string>
 	<key>CFBundleShortVersionString</key>
-	<string>1.4.1</string>
+	<string>1.4.2</string>
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>

CoreStore/Observing/ListMonitor.swift

@@ -335,6 +335,56 @@ public final class ListMonitor<T: NSManagedObject> {
         return sections[section]
     }
     
+    /**
+     Returns the `NSFetchedResultsSectionInfo`s for all sections
+     
+     - returns: the `NSFetchedResultsSectionInfo`s for all sections
+     */
+    @warn_unused_result
+    public func sections() -> [NSFetchedResultsSectionInfo] {
+        
+        CoreStore.assert(
+            !self.isPendingRefetch || NSThread.isMainThread(),
+            "Attempted to access a \(typeName(self)) outside the main thread while a refetch is in progress."
+        )
+        
+        return self.fetchedResultsController.sections ?? []
+    }
+    
+    /**
+     Returns the target section for a specified "Section Index" title and index.
+     
+     - parameter title: the title of the Section Index
+     - parameter index: the index of the Section Index
+     - returns: the target section for the specified "Section Index" title and index.
+     */
+    @warn_unused_result
+    public func targetSectionForSectionIndex(title title: String, index: Int) -> Int {
+        
+        CoreStore.assert(
+            !self.isPendingRefetch || NSThread.isMainThread(),
+            "Attempted to access a \(typeName(self)) outside the main thread while a refetch is in progress."
+        )
+        
+        return self.fetchedResultsController.sectionForSectionIndexTitle(title, atIndex: index)
+    }
+    
+    /**
+     Returns the section index titles for all sections
+     
+     - returns: the section index titles for all sections
+     */
+    @warn_unused_result
+    public func sectionIndexTitles() -> [String] {
+        
+        CoreStore.assert(
+            !self.isPendingRefetch || NSThread.isMainThread(),
+            "Attempted to access a \(typeName(self)) outside the main thread while a refetch is in progress."
+        )
+        
+        return self.fetchedResultsController.sectionIndexTitles
+    }
+    
     /**
     Returns the index of the `NSManagedObject` if it exists in the `ListMonitor`'s fetched objects, or `nil` if not found.