Add gypi and readme files for Mac

Author: Mykola Tryshnivskyy

platform/mac/Readme_4.8.5.txt

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+Minumum Requirements
+---------------------
+* Qt Mac OS X install: 
+Download QT sources from 
+http://download.qt-project.org/official_releases/qt/4.8/4.8.5/qt-everywhere-opensource-src-4.8.5.zip
+Unzip and build sources for 32bit architecture, because binary installation package is 64-bit only
+> configure -release -fast -opensource -confirm-license -arch i386
+> make
+> make install
+See more details here
+http://qt-project.org/doc/qt-4.8/install-mac.html
+
+Setup:
+------
+In command prompt run WebDriver or WebDriver_noWebkit

platform/mac/Readme_5.1.0.txt

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+Minumum Requirements
+---------------------
+* Qt Mac OS X install: 
+Download QT sources from 
+http://download.qt-project.org/official_releases/qt/5.1/5.1.0/single/qt-everywhere-opensource-src-5.1.0.tar.gz
+Untar and build sources for 32bit architecture
+> configure -release -fast -opensource -confirm-license -platform macx-clang-32 -no-framework
+> make
+> make install
+See more details here
+http://qt-project.org/doc/qt-4.8/install-mac.html
+
+Setup:
+------
+In command prompt run WebDriver or WebDriver_noWebkit

platform/mac/wd_qt4.8.5.gypi

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+{
+  'variables': {
+    'QT5': '0', # change to '1' for enabling Qt5
+    'DESKTOP_QT_BIN_PATH': '/usr/local/Trolltech/Qt-4.8.5/bin',
+    'DESKTOP_QT_INC_PATH': '/usr/local/qt-4.8.5/include',
+    'DESKTOP_QT_LIB_PATH': '/usr/local/Trolltech/Qt-4.8.5/lib',
+    'INTERMEDIATE_DIR': 'mocs',
+  },
+}