Ignore Podfile.lock (#297)

Summary:
This PR puts Podfile.lock in gitignore
Pull Request resolved: https://github.com/facebook/flipper/pull/297

Reviewed By: passy

Differential Revision: D10447350

Pulled By: priteshrnandgaonkar

fbshipit-source-id: 8de6e92f6e53972e8dc5af3b09d18259020c89c5

iOS/Podfile.lock

@@ -1,61 +0,0 @@
-PODS:
-  - boost-for-react-native (1.63.0)
-  - CocoaAsyncSocket (7.6.3)
-  - CocoaLibEvent (1.0.0)
-  - DoubleConversion (1.1.5)
-  - Flipper (0.7.2):
-    - Folly (~> 1.1)
-    - RSocket (~> 0.10)
-  - Folly (1.1.0):
-    - boost-for-react-native
-    - CocoaLibEvent (~> 1.0)
-    - DoubleConversion
-    - glog
-    - OpenSSL-Static (= 1.0.2.c1)
-  - glog (0.3.4)
-  - OpenSSL-Static (1.0.2.c1)
-  - PeerTalk (0.0.2)
-  - RSocket (0.10.0):
-    - Folly
-
-DEPENDENCIES:
-  - CocoaAsyncSocket (~> 7.6)
-  - DoubleConversion (~> 1.1)
-  - Flipper (from `../Flipper.podspec`)
-  - Folly (~> 1.0)
-  - glog (~> 0.3)
-  - PeerTalk (~> 0.0)
-  - RSocket (~> 0.10)
-
-SPEC REPOS:
-  https://github.com/cocoapods/specs.git:
-    - boost-for-react-native
-    - CocoaAsyncSocket
-    - CocoaLibEvent
-    - DoubleConversion
-    - glog
-    - OpenSSL-Static
-  https://github.com/facebook/Sonar.git:
-    - Folly
-    - PeerTalk
-    - RSocket
-
-EXTERNAL SOURCES:
-  Flipper:
-    :path: "../Flipper.podspec"
-
-SPEC CHECKSUMS:
-  boost-for-react-native: 39c7adb57c4e60d6c5479dd8623128eb5b3f0f2c
-  CocoaAsyncSocket: eafaa68a7e0ec99ead0a7b35015e0bf25d2c8987
-  CocoaLibEvent: 2fab71b8bd46dd33ddb959f7928ec5909f838e3f
-  DoubleConversion: e22e0762848812a87afd67ffda3998d9ef29170c
-  Flipper: 495fbd327298fbc55b3ff7cb399eae52c1580494
-  Folly: dd92f69322d8535b9df98d7c91e442b0fce2fff2
-  glog: 1de0bb937dccdc981596d3b5825ebfb765017ded
-  OpenSSL-Static: bd17e34564a8591ad76b740318683a6caa19a13e
-  PeerTalk: 77481b0a8136f226b90ccf828d6061f70139ffde
-  RSocket: 4fdb7e562db30a2d4fceddefdc601749ffc9ebe2
-
-PODFILE CHECKSUM: 31bacaa95d90ebfc33e2ca7a8235227e4339f2fd
-
-COCOAPODS: 1.5.3