support ios 7 with static libs

Author: morganchen12

FirebaseUI.podspec

@@ -7,7 +7,7 @@ Pod::Spec.new do |s|
   s.author       = 'Firebase'
   s.source       = { :http => 'https://github.com/firebase/FirebaseUI-iOS/releases/download/0.5.4/FirebaseUIFrameworks.zip' }
   s.platform = :ios
-  s.ios.deployment_target = '8.0'
+  s.ios.deployment_target = '7.0'
   s.ios.framework = 'UIKit'
   s.requires_arc = true
   s.default_subspecs = 'All'

FirebaseUI.xcodeproj/project.pbxproj

@@ -1930,7 +1930,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 7.0;
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				OTHER_CFLAGS = "";
@@ -1974,7 +1974,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 7.0;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				OTHER_CFLAGS = "";
 				SDKROOT = iphoneos;
@@ -2020,7 +2020,7 @@
 		8DBA0F551D872E1C00D113D3 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 7.0;
 				OTHER_LDFLAGS = (
 					"$(inherited)",
 					"-ObjC",
@@ -2033,7 +2033,7 @@
 		8DBA0F561D872E1C00D113D3 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 7.0;
 				OTHER_LDFLAGS = (
 					"$(inherited)",
 					"-ObjC",
@@ -2046,7 +2046,7 @@
 		8DBA0F631D872E2400D113D3 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 7.0;
 				OTHER_LDFLAGS = (
 					"$(inherited)",
 					"-ObjC",
@@ -2059,7 +2059,7 @@
 		8DBA0F641D872E2400D113D3 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 7.0;
 				OTHER_LDFLAGS = (
 					"$(inherited)",
 					"-ObjC",
@@ -2072,7 +2072,7 @@
 		8DBA0F701D872E2E00D113D3 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 7.0;
 				OTHER_LDFLAGS = (
 					"$(inherited)",
 					"-ObjC",
@@ -2085,7 +2085,7 @@
 		8DBA0F711D872E2E00D113D3 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 7.0;
 				OTHER_LDFLAGS = (
 					"$(inherited)",
 					"-ObjC",
@@ -2098,7 +2098,7 @@
 		8DBA0F7D1D872E3500D113D3 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 7.0;
 				OTHER_LDFLAGS = (
 					"$(inherited)",
 					"-ObjC",
@@ -2111,7 +2111,7 @@
 		8DBA0F7E1D872E3500D113D3 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 7.0;
 				OTHER_LDFLAGS = (
 					"$(inherited)",
 					"-ObjC",