[ci-skip] Adding binary download link and cleaning up Windows build instructions

Author: mikefero

README.md

@@ -8,6 +8,7 @@ This is a wrapper around [the DataStax C/C++ Driver for Apache Cassandra and Dat
 
 * Docs: [http://datastax.github.io/php-driver/](http://datastax.github.io/php-driver/)
 * Code: [https://github.com/datastax/php-driver](https://github.com/datastax/php-driver)
+* Binaries: [http://downloads.datastax.com/php-driver/](http://downloads.datastax.com/php-driver/)
 * Jira: [https://datastax-oss.atlassian.net/browse/PHP](https://datastax-oss.atlassian.net/browse/PHP)
 * Mailing List: [https://groups.google.com/a/lists.datastax.com/forum/#!forum/php-driver-user](https://groups.google.com/a/lists.datastax.com/forum/#!forum/php-driver-user)
 * IRC: #datastax-drivers on [irc.freenode.net](http://freenode.net>)

ext/README.md

@@ -112,6 +112,12 @@ Visual Studio installed you will be prompted to which version to use when
 compiling the driver.
 
 First you will need to open a "Command Prompt" to execute the batch script.
+Running the batch script without any arguments will build the driver for PHP
+v5.6 with Zend thread safety (ZTS) and for the current system architecture
+(e.g. x64).
+
+To perform advanced build configuration, execute the batch script with the
+`--HELP` argument to display the options available.
 
 ```dos
 Usage: VC_BUILD.BAT [OPTION...]
@@ -136,36 +142,6 @@ Usage: VC_BUILD.BAT [OPTION...]
 *** Default target architecture is determined based on system architecture
 ```
 
-To build 32-bit extension library with Zend thread safety:
-
-```dos
-VC_BUILD.BAT --X86
-```
-
-To build 32-bit extension library with thread safety disabled:
-
-```dos
-VC_BUILD.BAT --X86 --DISABLE-THREAD-SAFETY
-```
-
-To build 64-bit shared library with Zend thread safety:
-
-```dos
-VC_BUILD.BAT --X64
-```
-
-To build the default system architecture using PHP v5.5:
-
-```dos
-VC_BUILD.BAT --PHP-VERSION 5.5
-```
-
-To build the default system architecture using Boost atomic implementation:
-
-```dos
-VC_BUILD.BAT --USE-BOOST-ATOMIC
-```
-
 #### Enable Testing
 
 Ensure the driver is built with --ENABLE-TEST-CONFIGURATION in order to execute