Updates to gitignore, src/CMakeLists.txt and readme, per Han Zhu's requests

Removed the * from *.DS_Store in .gitignore

Removed ${WARNINGS} from the non-apple clause in src/CMakeLists.txt making it
equivalent to the non-apple behavior before this branch.

Updated README.md with instructions for building unit tests as the CMake module
for finding libunittest++ works now.

.gitignore

@@ -187,4 +187,4 @@ Microsoft.WindowsAzure.Storage/build.*/
 # OSX detritus
 # ==========================
 
-*.DS_Store
+.DS_Store

Microsoft.WindowsAzure.Storage/src/CMakeLists.txt

@@ -58,7 +58,7 @@ endif()
 if (APPLE)
 	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${WARNINGS}")
 else()
-	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${WARNINGS}")
+	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
 endif()
 
 add_library(${AZURESTORAGE_LIBRARY} ${SOURCES})

README.md

@@ -193,7 +193,22 @@ CASABLANCA_DIR=~/Github/Casablanca/cpprestsdk cmake .. -DCMAKE_BUILD_TYPE=Releas
 ```
 The library is generated under `azure-storage-cpp/Microsoft.WindowsAzure.Storage/build.release/Binaries/`.
 
-*As yet the unit tests don't build, because cmake won't find UnitTest++ even though it is installed via Homebrew*
+To build and run unit tests:
+- Install UnitTest++ library:
+```bash
+brew install unittest-cpp
+```
+- Build the test code:
+```bash
+cmake .. -DCMAKE_BUILD_TYPE=Release -DBUILD_TESTS=ON
+make
+```
+- Run unit tests
+```bash
+cd Binaries
+vi test_configurations.json # modify test config file to include your storage account credentials
+./azurestoragetest
+```
 
 # Learn More
 - [Microsoft Azure Storage Client Library for C++ v2.0.0](documentation/Microsoft%20Azure%20Storage%20Client%20Library%20for%20C%2B%2B%202.0.0.md)