add FindLibcuckoo module and instructions for dropping in libcuckoo

.gitignore

@@ -32,5 +32,9 @@ DerivedData
 interface/external/*/*
 !interface/external/*/readme.txt
 
+# ignore libraries externals
+libraries/*/externals/*/*
+!libraries/*/externals/*/readme.txt
+
 # Ignore interfaceCache for Linux users
 interface/interfaceCache/

cmake/modules/FindLibcuckoo.cmake

@@ -0,0 +1,29 @@
+#  FindLibCuckoo.cmake
+# 
+#  Try to find libcuckoo.
+#
+#  You can provide a LIBCUCKOO_ROOT_DIR which contains src and include directories
+#
+#  Once done this will define
+#
+#  LIBCUCKOO_FOUND - system found libcuckoo
+#  LIBCUCKOO_INCLUDE_DIRS - the libcuckoo include directory
+#
+#  Created on 5/11/2014 by Stephen Birarda
+#  Copyright 2014 High Fidelity, Inc.
+#
+#  Distributed under the Apache License, Version 2.0.
+#  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+#
+
+include("${MACRO_DIR}/HifiLibrarySearchHints.cmake")
+hifi_library_search_hints("libcuckoo")
+
+find_path(LIBCUCKOO_INCLUDE_DIRS cuckoohash_map.hh PATH_SUFFIXES libcuckoo HINTS ${LIBCUCKOO_SEARCH_DIRS})
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(
+  libcuckoo
+  "Could NOT find libcuckoo. Read libraries/networking/externals/libcuckoo/readme.txt" 
+  LIBCUCKOO_INCLUDE_DIRS
+)

libraries/networking/CMakeLists.txt

@@ -10,9 +10,12 @@ if (WIN32)
   target_link_libraries(${TARGET_NAME} ws2_32.lib)
 endif ()
 
-# find OpenSSL
+# find required dependencies
 find_package(OpenSSL REQUIRED)
 
+list(APPEND LIBCUCKOO_ROOT_DIR "${CMAKE_CURRENT_SOURCE_DIR}/externals/libcuckoo")
+find_package(libcuckoo REQUIRED)
+
 if (APPLE AND ${OPENSSL_INCLUDE_DIR} STREQUAL "/usr/include")
   # this is a user on OS X using system OpenSSL, which is going to throw warnings since they're deprecating for their common crypto
   message(WARNING "The found version of OpenSSL is the OS X system version. This will produce deprecation warnings."

libraries/networking/externals/libcuckoo/readme.txt

@@ -0,0 +1,14 @@
+
+Instructions for adding the libcuckoo library to Interface
+Stephen Birarda, November 5, 2014
+
+1. Download the libcuckoo ZIP from the High Fidelity libcuckoo fork on Github.
+  	https://github.com/highfidelity/libcuckoo/archive/master.zip
+   
+2. Copy the libcuckoo folder from inside the ZIP to libraries/networking/externals/libcuckoo/.
+	
+	You should have the following structure:
+	
+	libraries/networking/externals/libcuckoo/libcuckoo/cuckoohash_map.hh
+   
+3. Delete your build directory, run cmake and build, and you should be all set.