* Expose network management in public API
* Clean up a few more references to the internal access of network management
* Move test
* Update comments
* Swap _Nullable for nullable
* Fix comment
* Add tests, including swift
* Styling
* make FIRDocumentListenOptions.includeMetadataChanges private
as discussed in Firestore API discussion, the name clashes creates confusion. Android SDK already not exposing the property; here change iOS SDK to match it.
* update CHANGELOG
* implement queryFilteredUsingPredicate in FIRQuery;
* add unit test and integration test for queryFilteredUsingPredicate;
* project change of adding the FIRQueryTests.m file;
* refactoring queryFilteredUsingPredicate to split logic into two helpers;
* Replacing FIR_SWIFT_NAME macro with NS_SWIFT_NAME.
This pushes the minimum Xcode version to 7.3, as NS_SWIFT_NAME was
limited before that version (which is why the macro was introduced in
the first place).
* Fixed FIRMessaging header