Moved Flipper podspec outside (#423)

Summary:
Removed the symlink and moved `Flipper.podspec` and `FlipperKit.podspec` to the root directory. Also published `Flipper.podspec` and `FlipperKit.podspec`on cocoapods

http://cocoapods.org/pods/Flipper
http://cocoapods.org/pods/FlipperKit

Also removed the stub podspec files.

Released Flipper and FlipperKit on Cocoapods
Pull Request resolved: https://github.com/facebook/flipper/pull/423

Reviewed By: passy

Differential Revision: D15146621

Pulled By: priteshrnandgaonkar

fbshipit-source-id: 86ee16773a81b0896548169cba49810250122ec1

Flipper.podspec

@@ -1 +0,0 @@
-xplat/Flipper/Flipper.podspec

Flipper.podspec

@@ -0,0 +1,24 @@
+flipperkit_version = '0.20.0'
+Pod::Spec.new do |spec|
+  spec.name = 'Flipper'
+  spec.version = flipperkit_version
+  spec.license = { :type => 'MIT' }
+  spec.homepage = 'https://github.com/facebook/sonar'
+  spec.summary = 'SonarKit core cpp code with network implementation'
+  spec.authors = 'Facebook'
+  spec.source = { :git => 'https://github.com/facebook/Sonar.git',
+                  :tag => 'v'+flipperkit_version }
+  spec.module_name = 'Flipper'
+  spec.public_header_files = 'xplat/Flipper/*.h','xplat/utils/*.h'
+  spec.source_files = 'xplat/Flipper/*.{h,cpp,m,mm}','xplat/Flipper/utils/*.{h,cpp,m,mm}'
+  spec.libraries = "stdc++"
+  spec.dependency 'Flipper-Folly', '1.3.0'
+  spec.dependency 'Flipper-RSocket', '0.10.4'
+  spec.compiler_flags = '-DFLIPPER_OSS=1 -DFB_SONARKIT_ENABLED=1 -DFOLLY_NO_CONFIG -DFOLLY_MOBILE=1 -DFOLLY_USE_LIBCPP=1 -DFOLLY_HAVE_LIBGFLAGS=0 -DFOLLY_HAVE_LIBJEMALLOC=0 -DFOLLY_HAVE_PREADV=0 -DFOLLY_HAVE_PWRITEV=0 -DFOLLY_HAVE_TFO=0 -DFOLLY_USE_SYMBOLIZER=0 -Wall
+    -std=c++14
+    -Wno-global-constructors'
+  spec.platforms = { :ios => "8.0" }
+  spec.pod_target_xcconfig = { "USE_HEADERMAP" => "NO",
+                               "CLANG_CXX_LANGUAGE_STANDARD" => "c++14",
+                               "HEADER_SEARCH_PATHS" => "\"$(PODS_TARGET_SRCROOT)\" \"$(PODS_ROOT)/boost-for-react-native\" \"$(PODS_ROOT)/Flipper-RSocket\" \"$(PODS_ROOT)/DoubleConversion\"" }
+end